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Bird Guides

15 Types of Blue Birds in North America

The color blue is extremely rare in nature, making it more mesmerizing than it already is. A few flowers and birds are blue, but beyond that, we don’t see much else of that hue when admiring wildlife. A blue bird really is a sight to see, so it’s a good idea to familiarize yourself with blue birds in North America so you can admire and identify them.

Common Blue Bird Species in North America

If you live in North America, you might see a few blue bird species appear in your backyard. Keep an eye out for the following birds.

1. Eastern Bluebird (Common blue bird in North America)

  • Scientific Name: Sialia sialis
  • Location: Open areas from southeastern Canada to Nicaragua
  • Size: 6 to 8 inches
Eastern Bluebird Eats a Berry
Image by Louis Ruttkay via Flickr.

With a name like “bluebird,” it’s hard not to think of this species when looking for birds with a blue hue. Male eastern bluebirds have stunning light blue feathers everywhere besides their pale red-orange chests and white bellies. Females only have pale blue feathers on their wings while everything else is white or rusty brown. To attract females, males wave their blue wings around while sitting in nest cavities.

2. Western Bluebird

  • Scientific Name: Sialia mexicana
  • Location: Semi-open woodlands and forest edges across western North America
  • Size: 6 to 7.5 inches
A western bluebird perched on top of a wooden post.
Image by C_yat via Flickr.

Western bluebirds have a similar appearance to eastern bluebirds because they have blue feathers, red-orange chests, and white bellies. However, the blue on male western bluebirds is much brighter than on other bluebird species. Sometimes, other birds who have lost their own nests will help western bluebirds tend to their nests and raise their young.

3. Mountain Bluebird

  • Scientific Name: Sialia currucoides
  • Location: Open grasslands and mountain meadows across western North America
  • Size: 6 to 7 inches
A mountain bluebird eating an insect perched on top of a shrub.
Image by Wesley Barr via Flickr.

Mountain bluebirds lack the white and red-orange feathers of other bluebirds and are instead light blue all over. Females are mostly gray-brown with small patches of blue on their wings and tail. These blue birds nest in existing cavities, such as spaces excavated by woodpeckers or artificial nest boxes. Rather than focusing on factors like songs, colors, and mating displays, females choose males based on the quality of nesting cavity they provide.

4. Blue Jay (Recognizable blue bird)

  • Scientific Name: Cyanocitta cristata
  • Location: Woodlands of eastern and central North America
  • Size: 10 to 12 inches
Blue Jay With Crest
Image by Steve Jones via Flickr.

When people picture a blue bird in North America, a blue jay is probably the species that comes to mind. Blue jays have an iconic look that includes blue, white, and black feathers, along with a pointed crest. Unlike bluebirds, both male and female blue jays are bright blue. Blue jays can mimick the calls of other birds, and they most commonly repeat sounds of hawks.

5. Blue Grosbeak

  • Scientific Name: Passerina caerulea
  • Location: Fields and woodland edges across Mexico and southern United States
  • Size: 5.5 to 7.5 inches
A blue grosbeak perched on a leafy branch.
Image by Dklaughman via Flickr.

Male blue grosbeaks are dark blue with rusty brown stripes on their wings. However, females are almost completely brown with only pale blue markings on their wings. Like other grosbeaks, this species has thick, curved bills that are perfect for cracking hard shells of seeds. Yet, their primary source of food is insects when available.

6. Indigo Bunting

  • Scientific Name: Passerina cyanea
  • Location: Fields and forest edges from southeastern Canada to northern South America
  • Size: 4.5 to 5 inches
Indigo Bunting in Spring Blossom
Image by Matthew Studebaker via Flickr.

Indigo buntings have bold blue feathers that are impossible not to notice among the greens and browns that typically appear in nature. Females are brown all over, allowing them to blend in easier. These blue birds migrate at night, following the stars to help them determine direction. Indigo buntings sing different songs depending on where they grew up because they listen to other birds to learn the notes.

7. Florida Scrub Jay (Blue bird with small range)

  • Scientific Name: Aphelocoma coerulescens
  • Location: Only in the Florida scrub
  • Size: 9 to 11 inches
A Florida Scrub-jay - Corvidae Exclusive to Florida
Image by Alanj2007 via Flickr.

This pale white and blue bird exists in North America, but only in a very small range. They only live in Florida, specifically the sandy, scrubby areas of the state. They’re social birds that rarely travel more than a few miles from the place they hatched. So, the offspring often stick around when they’re full-grown to help their families raise future broods.

8. Mexican Jay

  • Scientific Name: Aphelocoma wollweberi
  • Location: Mountain woodlands of Arizona, New Mexico, and Mexico
  • Size: 10.5 to 12.5 inches
A Mexican Jay
Image by Gary Seloff via Flickr.

Both male and female Mexican jays have solid blue feathers on their backs and bright white bellies. Their appearance may vary slightly based on the elevation they live at. For example, Mexican jays of lower elevations have hooked bills designed for eating acorns while those in high elevations have straight bills that make it easier to eat pine nuts. They use their bills to stab acorns and nuts to access the interior.

9. Cerulean Warbler

  • Scientific Name: Setophaga cerulea
  • Location: Deciduous forests from eastern United States to northern South America
  • Size: 4 to 4.5 inches
A Cerulean Warbler
Image by Edward Post via Flickr.

This beautiful blue bird species is mostly blue with a white belly and white patches. Females appear more green than blue. During the breeding season, they live in the northeastern United States, but then they migrate all the way down to South America. Once they reach South America, they often gather in mixed-species flocks.

10. Steller’s Jay (Bird with blue body)

  • Scientific Name: Cyanocitta stelleri
  • Location: Coniferous and mixed mountain forests of western North America
  • Size: 11.5 to 13.5 inches
A Steller's Jay Perching
Image by Steve Jones via Flickr.

Steller’s jays have a striking appearance that includes a bright blue lower body and a dark gray neck and head with a tall crest. Both males and females display this unique color pattern. The exact placement of the blue and dark gray feathers may vary between regions, with some birds having more blue than gray. Even though these birds are so recognizable, they can be tricky to spot because they hang out high in the tree canopies. 

11. Tree Swallow

  • Scientific Name: Tachycineta bicolor
  • Location: Open areas near water across North America
  • Size: 4.5 to 6 inches
A Tree Swallow Calls
Image by Insu Nuzzi via Flickr.

Male and female tree swallows both have shimmering blue-green feathers on their backs and white bellies. However, males are the more vibrant of the two. Even though they typically fly in open areas, they find tree cavities for nesting, which is how they got their name. These little birds are great at flying, sometimes catching insects in mid-air. When it’s time to migrate, tree swallows gather in massive groups, which could contain hundreds of thousands of birds.

12. Black-Throated Blue Warbler (Black and blue bird)

  • Scientific Name: Setophaga caerulescens
  • Location: Dense hardwood forests of eastern North America
  • Size: 4.5 to 5 inches
A Black-throated Blue Warbler
Image by Edward Post via Flickr.

Male black-throated warblers have a dark mask around their eyes and throats, but the remainder of their bodies are blue and white. Females are a solid light brown color that looks very different from the uniquely-patterned males. Since males and females look nothing alike at first glance, they used to be labeled as different species. You may hear these warblers make relaxed, buzzy songs.

13. Blue Bunting

  • Scientific Name: Cyanocompsa parellina
  • Location: Thickets and woodlands from Mexico to Nicaragua
  • Size: 5 to 5.5 inches
A Blue Bunting
Image by Daniel Arndt via website, Instagram and Facebook.

Male blue buntings resemble indigo buntings, but this species has a thicker bill and varying shades of blue. Their feathers are often a lighter blue near the face and darker around the body. Females are a dark brown hue. As beautiful as these birds are, they can be hard to spot since they don’t live near humans and travel alone or in pairs rather than large flocks.

14. Lazuli Bunting

  • Scientific Name: Passerina amoena
  • Location: Open, brushy areas of eastern North America
  • Size: 5 to 6 inches
A Luzuli Bunting Singing
Image by Eric Zhou via Flickr.

The lazuli bunting has a distinct light blue head, which only appears on males. Then, males have an orange-red chest and white belly, similar to the eastern bluebird’s colors. Female lazuli buntings have solid light brown feathers, so they blend in better. This blue bird species can recognize other birds by their voice. Young birds learn the songs of nearby birds and end up copying their calls as they grow up, so sounds vary based on location.

15. Red-Legged Honeycreeper (Extremely vibrant blue bird)

  • Scientific Name: Cyanerpes cyaneus
  • Location: Forests from southern Mexico to central South America
  • Size: 4.5 to 5 inches
A close-up shot of a red-legged honeycreeper resting on a thick tree branch.
Image by Arthur Steinberger via Flickr.

Red-legged honeycreepers aren’t widespread across North America, but instead, they only live in southern Mexico, extending all the way to central South America. These blue birds are striking because they have bright red legs, dark blue bodies, and light blue crests. The coloring almost looks too vibrant to be real. They’re active birds that constantly move across the forest canopy.

Identifying Blue Bird Species in North America

Colorful birds stand out in a flock, so next time you notice a blue bird in North America, see if you can identify it. All the above birds are colorful additions to backyards, and there are even more blue bird species not listed. See how many of these species you can find next time you’re out exploring nature.

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Bird Debates

Are Bird Feeders Helping or Harming Wild Bird Populations?

Ask a room full of U.S. birders about feeders and you’ll get everything from misty-eyed joy (goldfinches on nyjer at breakfast!) to stern warnings about disease and unintended consequences. So let’s do what good naturalists do: step back, look at the evidence, and keep our cool—binoculars in one hand, feeder brush in the other.

A cardinal using a suet bird feeder.
Image by Ken’s Photographic World via Flickr.

The upside: survival boosts, resilience, and the joy factor

When the weather turns mean, a well-run feeder can be a literal lifeline. In classic North American work on Black-capped Chickadees, birds with winter access to supplemental food had much higher overwinter survival—69% versus 37% for unfed birds—with the biggest gains during severe cold snaps. That’s not a rounding error; that’s life or death. ESA Journalsaldoleopold.org

Health can improve too. A multi-year U.S. study comparing fed and unfed sites found birds at feeders tended to show better body condition, lower physiological stress, and stronger innate immunity. (Caveat incoming in the next section.) PMC

And the “dependency” worry? Radio-tag studies on chickadees suggest birds stay savvy foragers; they don’t become helpless if the buffet closes, at least in winter. In other words, they like your sunflower hearts—but they’re not forgetting how to find food. Newsroom

Feeders also shape who shows up in our neighborhoods. In the U.S., provisioning has likely helped some species expand northward, like Northern Cardinals and Carolina Wrens—part habitat change, part free calories. Whether you think that’s good or not, it’s real. U.S. Fish and Wildlife Service

Two carolina wrens using a bird feeder.
Image by blueridgekitties via Flickr.

My favorite “humans changed birds” twist? Recent work in California shows that Anna’s Hummingbirds have literally shifted bill shape over the last century, with longer, more tapered beaks linked to the rise of backyard nectar feeders—and the species’ dramatic range expansion along the West Coast. Evolution, right at the kitchen window. PubMedAudubon

The downside: disease, collisions, and predator hotspots

Here’s where we need to be adults about it.

Disease spreads where birds crowd

Feeders concentrate birds, and crowded birds share pathogens. We’ve had painful reminders:

  • Salmonella outbreaks (notably the big 2020–21 pine siskin irruption) prompted health advisories—including from CDC—to pause feeding, deep-clean equipment, and manage spillage. CDC ArchiveCDC
  • The long-running House Finch eye disease (Mycoplasma gallisepticum) first detected in the mid-1990s spread across North America—again, close contact at feeders helps diseases hop between hosts. All About BirdsFeederWatch

Bottom line: feeders can bolster individual health and amplify disease risk if hygiene slips. Both things can be true. PMC

Windows: the invisible killer

If you feed, you’re responsible for your glass. U.S. estimates now put window collisions at up to ~1 billion bird deaths annually. The fix is straightforward: treat the glass (patterns on the outside that follow tight spacing rules) and place feeders either very close to windows (<3 ft/1 m) or well away (>30 ft/9 m) to avoid high-speed impacts. New guidance suggests using 2-inch spacing (horizontal or vertical) for most markers to protect even hummingbirds. U.S. Fish and Wildlife ServiceAll About BirdsNational Park Service

Predator dynamics

A black and white cat lies down next to a bird it has killed.
Image by Itemfebank via Flickr.

Feeders can create ambush points. In suburbia that’s often Cooper’s and Sharp-shinned Hawks doing exactly what hawks evolved to do. Smart placement—near dense cover for quick escapes, not in open “runways”—keeps things fair. (And if you’re also managing outdoor cats, thank you.) Penn State

The plot twists: not all “help” helps, and details matter

A few studies (many from Europe, but instructive) found that the type and timing of food can nudge breeding outcomes—sometimes negatively—likely via nutrition mismatches or survival of poorer-condition individuals that later struggle to fledge chicks. U.S. synthesis work echoes the theme: effects vary by species, season, and diet. Translation: what you offer matters, and “more fat, all winter” isn’t a universal recipe. Natureconservationevidence.com

At the community level, feeding can favor generalists and seed-eaters, subtly reshaping urban bird assemblages. That’s neither inherently good nor bad—but it’s a reminder that feeders are ecological levers, not decorative lawn ornaments. PMC

So…are feeders helping or harming?

Short answer: both are possible. Feeders are tools. Used well, they buffer birds through tough spells, connect people to wildlife (which drives conservation), and even contribute to fascinating natural experiments like the hummingbird story. Used poorly, they spread disease, magnify collision risk, and turn into predator traps.

The question isn’t “feed or don’t feed.” It’s how to feed well in the U.S. context.

Feed like a pro: a U.S.-centric, evidence-based playbook

Coal Tits on Bird Feeder
Image by Brian Kennedy via Flickr

1) Hygiene is non-negotiable

  • Scrub and disinfect feeders and birdbaths regularly—weekly is a good baseline; clean immediately if food gets wet or you see sick birds. If illness appears, take feeders down for 2–4 weeks, clean thoroughly, rake up spillage, then restart. Keep surfaces where birds stand off the food (flat trays are riskier). AudubonFeederWatch

2) Make your glass safe first, then place feeders well

3) Offer the right foods, the right way

  • Quality black-oil sunflower, sunflower hearts, fresh nyjer, and species-appropriate suet in cold weather are reliable staples. For hummingbirds, stick to 1:4 sugar-to-water, no dye, and change nectar often in heat. (Red plastic on the feeder is plenty of color.) AudubonAll About Birds

4) Design for quick getaways, not ambushes

  • Give birds nearby cover (shrubs within a short hop), avoid long, exposed approaches, and accept that raptors happen. Move feeders if you notice repeated ambush patterns. Penn State

5) Track local advisories

  • During disease outbreaks (e.g., Salmonella in irruption years) or regional avian flu guidance, follow agency advice—even if that means pausing feeders. CDC ArchiveCDC

6) Think beyond the feeder

  • Native plants, messy corners, seedheads in winter, water features with moving water—these are the long game. Federal and NGO guidance also reminds us that while we love feeding, wildlife feeding carries responsibilities; do it thoughtfully. U.S. Fish and Wildlife ServiceAudubon

Final thoughts (and a friendly challenge)

If you came for a verdict: bird feeders are net helpful when we run them well—hygienic, glass-safe, thoughtfully placed, nutritionally sensible, and paired with real habitat. They’re net harmful when we ignore those responsibilities.

A backyard bird feeder with a variety of species of blackbirds using it.
Image by Ray F via Flickr.

So keep the joy and ditch the risks. Clean often. Treat windows. Offer good food. Watch local advisories. Plant that serviceberry you’ve been eyeing. Because the best “feeder” in your yard is still the one with roots—and your hopper is the winter safety net that helps your backyard birds make it to spring. U.S. Fish and Wildlife ServiceESA JournalsPMCAudubonCDC Archive

Categories
Bird Debates

Do Bird Houses Help Nature or Interfere with It?

Few topics split backyard naturalists like bird houses. Some folks swear their bluebird house is biodiversity’s best friend; others worry we’re meddling – creating predator magnets, disease hubs, or tiny ovens in July. So let’s zoom out, sift through the evidence, and – like a good wren – keep things tidy.

A carolina wren using a nest box.
Image by Peter Schreck via Flickr.

The upside: when bird houses really help

Bluebirds, wood ducks, martins – receipts, please

Cavity nesters lose homes when old trees and snags disappear. That’s where bird houses shine. The Eastern Bluebird’s famous comeback in the late 20th century rode on the shoulders of thousands of well-managed “bluebird trails” and a new conservation movement dedicated to getting the specs right.

Wood Ducks? Once hammered by habitat loss and market hunting, they rebounded in part because people put up safe nesting structures near wetlands – a conservation classic that continues today.

And Purple Martins in the eastern U.S. are now almost entirely dependent on human-provided housing. In other words, take down the martin houses and gourds, and in many places the colony goes with them.

A female martin pokes her head out of a nest box.
Image by Jason Taylor via Flickr.

Bird houses can boost local breeding

Across forests and working lands, well-placed bird houses can increase breeding opportunities for insect-eaters (think: pest control with wings) and help researchers monitor populations like the American Kestrel. The long-running kestrel bird house networks across the U.S. are a key data source while we figure out why the species is slipping in some regions.

The downside: when our help backfires

Predation and “ecological traps”

A bird house is only as safe as its mount. Put one on a tree without a baffle and you might as well hang a neon “Raccoon Diner” sign. Predator guards and pole mounting meaningfully improve nest success compared to unguarded bird houses; tree mounts are generally discouraged.

Then there’s the subtler problem: ecological traps. Birds can be lured to attractive bird houses in poor habitat or into microclimates that look fine to us but lower chick survival. Reviews flag higher maximum temperatures and less stable microclimates in many bird houses versus natural cavities – an emerging risk in hotter summers.

Heat: the tiny-oven problem

In heat waves, interior bird house temps can exceed lethal thresholds for nestlings. Orientation, shade, wall thickness, ventilation, and even insulated designs matter; south or east exposure warms differently by humidity and season. Translation: the “where” and “how” of your bird house can be the difference between thriving and frying.

Competition, disease, and the usual suspects

Bird houses don’t come with bouncers. House Sparrows and European Starlings (non-native and not protected by federal law) aggressively seize cavities and can harm native nesters; active management is often required. Poorly maintained bird houses can also harbor parasites and pathogens – especially when old nests are left to moulder.

A European Starling Juvenile
Image by Kevin E. Fox via Flickr.

The law (U.S. edition): what you can and can’t do

Under the Migratory Bird Treaty Act (MBTA), it’s illegal to harm native birds, their active nests, or eggs without a permit. There are exceptions for certain non-native species (e.g., House Sparrow, European Starling, Rock Pigeon). If you monitor bird houses, know the rules before you touch anything.

So…help or interfere?

Both. Bird houses are powerful tools that can either bolster conservation – or accidentally stack the deck against the very birds we’re trying to help. Success lives in the details: species-appropriate designs, smart placement, predator proofing, cleanliness, and – yep – restraint.

Build it right: a practical, U.S.-centric playbook

Right bird, right house, right place

Tufted Titmouse Nestbox in Florida
Image by Adam Scheiner.
  • Match the species. Hole size, floor dimensions, and mounting height aren’t interchangeable. Use reputable plans for your region (Cornell Lab’s NestWatch “Right Bird, Right House” is the gold standard).
  • Skip perches. They help predators, not birds. Choose untreated wood, thick walls (~¾”), drainage, cross-ventilation, and an overhanging roof. Make sure one panel opens for monitoring and cleaning.
  • Mount on a metal pole with a predator guard, not on a tree. Add a stovepipe or cone baffle; consider a hole guard at the entrance.

Beat the heat (and the cold)

  • In hot regions or exposed sites, orient to morning sun and afternoon shade, provide robust ventilation, and consider light-colored or insulated designs if your summers cook. Monitor interior temps during heat waves and add temporary shade if needed.

Keep it clean, keep it ethical

  • Clean between broods/years. Remove old nesting material to reduce mites, blowflies, and bacteria; disinfect if disease has occurred. Follow a code of conduct to minimize disturbance (short checks, no loitering, back off in bad weather).
  • Watch for invasives. Managing House Sparrows/Starlings is legal and often necessary; never remove eggs of native species (including Brown-headed Cowbirds) without a permit.

Special cases worth celebrating

  • Bluebirds: A 1½” entrance keeps starlings out while welcoming Eastern Bluebirds—textbook example of design choices saving a species in suburbia.
  • Wood Ducks: Bird houses over water with predator guards and proper wood shavings (no nest material otherwise) continue to bolster local populations.
  • Purple Martins: In the East, colonies largely exist because people maintain housing. If you host martins, you’re a conservation partner—keep those rigs managed and predator-proofed.
  • Kestrels: Bird house networks supply data and nest sites while we address bigger problems (habitat, prey, climate). Bird houses help, but they’re not a substitute for conserving open country.

Common myths (and quick corrections)

A Nestbox Being Used By a Chickadee
Image by Wesley Barr via Flickr.

“Any cute house will do.”

Most store-bought “decor” houses are too small, unventilated, or have perches. Choose function over cute. Features matter.

“If birds move in, the habitat must be good.”

Not necessarily. Bird houses can mask poor habitat quality (that ecological-trap problem). Aim to pair houses with native plants, reduced pesticides, and real cover.

“Tree mounts feel natural.”

They’re natural for predators. Poles + baffles win.

Verdict: help – don’t overhelp

Bird houses help nature when we treat them as stewardship tools: designed for the species, sited with care, guarded, ventilated, cleaned, and paired with better habitat. They interfere when they’re decorative afterthoughts, heat traps, predator feeders, or unmanaged sparrow factories.

So build smarter, mount wiser, clean often, and plant that snag-mimicking shrub line while you’re at it. Do that, and a simple cedar bird house becomes what we all want it to be: a tiny wooden vote for wild birds in a human world.

Categories
Bird Debates

Should governments control or cull overpopulated bird species?

Say the words pigeons, crows, or Canada geese in a city meeting and watch the room split. To some, these birds are resourceful urban survivors. To others, they’re crop wreckers, park foulers, airport hazards. Should governments step in with population control or culls, or should we lean on coexistence and non-lethal fixes? Let’s zoom out, weigh the evidence, and try to land this discussion without hitting any engines.

Overpopulated pigeons in New York City.
Image by Siobhan Gallagher via Flickr.

First principles: what the law actually says

In the U.S., most native birds are protected by the Migratory Bird Treaty Act (MBTA). You can’t kill or capture them without federal authorization. That includes crows and Canada geese. Rock Pigeons, European Starlings, and House Sparrows are exceptions because they’re non-native and not covered by the MBTA, though state and local rules still apply. U.S. Fish and Wildlife Service+1Federal Register

Canada geese have a special set of federal depredation and control orders. Agencies and registered landowners can oil or addle eggs, and in certain circumstances conduct roundups or lethal control to protect agriculture, public safety, or airports. These are spelled out in 50 CFR 21 subpart D and in the U.S. Fish and Wildlife Service’s resident goose registration system. Crows can be hunted in state-set seasons and, under specific orders or permits, lethally controlled to address damage or health risks. Legal Information InstituteU.S. Fish and Wildlife Service+1eCFR+1

The case for government control

Public safety at airports

After the 2009 “Miracle on the Hudson,” wildlife hazards at airports drew intense scrutiny. The USDA and cities have since used integrated programs near New York’s airports, including habitat modification and seasonal goose removals within a defined radius. Control orders specifically cover resident geese at airports and military airfields because bird strikes are a genuine risk. Even critics of culling often concede that aviation safety is a special case. USDANYC.goveCFR

Agriculture and parks

An overpopulated group of Canada geese feeding on a flooded field.
Image by Jerry Mcfarland via Flickr.

Large resident goose flocks can foul fields and athletic turf, degrade water quality, and damage crops. Federal depredation orders allow targeted actions when non-lethal tools aren’t enough. The intent is pragmatic: short-term lethal relief while longer-term measures are put in place. That sequencing is built into federal depredation permit guidance. eCFRU.S. Fish and Wildlife Service

When non-native species dominate

Because Rock Pigeons aren’t MBTA-protected, cities often deploy a full toolbox: exclusion, clean-up, improved waste management, and, increasingly, fertility control using EPA-registered nicarbazin bait (OvoControl). The public tends to view contraception as more humane than culling, and long-term programs can ratchet populations down when consistently managed. US EPAOvoControl®+1

The case against culling

Ethics and effectiveness

Culls can be emotionally charged and publicly messy. They also risk being a revolving door: remove birds without changing the habitat and the food, and new birds move in. That’s why federal policy stresses non-lethal methods first and frames lethal take as short-term relief while you fix underlying attractants. If a city skips the second part, it can end up paying for the same fight every summer. Legal Information InstituteU.S. Fish and Wildlife Service

Ecological roles and unintended consequences

An American Crow - Highly Intelligent Corvidae
Image by David B. Adams via Flickr.

Crows are ultra-smart omnivores with complex social lives. They scavenge waste and eat agricultural pests, and evidence that they drive broad songbird declines is mixed and context-dependent. Blunt reductions may miss the point if the real drivers are garbage access, open dumpsters, or roost trees over lit parking lots. Legal status matters here too: crows are MBTA-protected, so any lethal action outside set hunting seasons requires proper authority. eCFRwildlifecontroltraining.com

Public trust and social license

Nothing erodes a wildlife program faster than secrecy. Cities that announce a dawn roundup without prior engagement often face backlash and lawsuits. Transparent plans that publish the goals, methods, and humane standards fare better. Many communities now pair management with public education on feeding bans, trash control, and dog-on-leash rules near nesting areas.

What actually works: an integrated playbook

1) Fix the attractants first

  • Food waste control: secure dumpsters, enforce feeding bans, redesign trash pickups.
  • Habitat tweaks: replace goose-favored turf monocultures with taller native plantings along shorelines; reduce mow-to-the-water edges that act like goose runways. These changes make parks less attractive without fencing them off to people. eCFR

2) Non-lethal population tools

  • Egg addling or oiling for geese: legal with USFWS registration in much of the U.S., plus any state rules. Done correctly, it humanely prevents hatching and reduces future flock growth. U.S. Fish and Wildlife ServiceHumane World for Animals
  • Fertility control for pigeons: daily nicarbazin bait during the breeding season can steadily lower numbers when paired with sanitation. It’s EPA-registered and commonly used at large facilities. US EPA
  • Hazing and roost management for crows: use of noise, lights, and pruning to make habitual roosts less attractive, combined with trash control. Lethal options need permits and should be the last step. U.S. Fish and Wildlife Service

3) When lethal control is justified

  • Airports and immediate safety risks: focused, seasonal removals tied to flight paths and strike data, under federal control orders. Pair with habitat modification inside the airport fence. eCFR
  • Documented depredation: farms or facilities can apply for depredation permits where non-lethal methods have failed. Record-keeping and compliance are mandatory. U.S. Fish and Wildlife Service
A rock pigeon flying with its green and purple throat feathers shining in the sun.
Image by Mick Thompson via Flickr.

4) Monitor and adapt

Count birds before and after, publish the numbers, and be honest about costs. If a method isn’t bending the curve after a fair trial, switch. The most durable programs blend several tools and adjust seasonally.

A balanced verdict

Should governments ever control or cull overpopulated birds? Sometimes, yes. The law already recognizes cases where public safety and serious damage justify it, especially for resident Canada geese at airports and for non-native pigeons in chronic sanitation hotspots. But culling without prevention is a treadmill. The durable win is integrated management: remove the attractants, redesign the habitat, use fertility control or egg addling to slow the pipeline, and reserve lethal tools for the narrow circumstances where they are lawful, targeted, and clearly necessary. eCFRLegal Information InstituteOvoControl®

If you’re shaping policy in your community

A Flock of English Sparrow
Image by Mark Palmer via Flickr.

Start with transparency

Publish the plan, goals, legal basis, and humane standards. Hold a Q&A before action, and report outcomes afterward.

Make non-lethal the default

Codify trash and feeding rules, budget for addling or contraception, and redesign a few high-conflict parks.

Use permits correctly

MBTA-protected species like crows and Canada geese require federal authority for lethal take outside specific frameworks. Non-native pigeons are not MBTA-protected, but local and state laws still apply. Coordinate with USFWS and state wildlife agencies rather than freelancing. U.S. Fish and Wildlife Service+1

Measure success in complaints reduced, not bodies removed

The public cares whether the field is playable and the path is clean. If numbers and nuisance both drop, you’ve nailed it.

Categories
Bird Debates

Should we stop mowing lawns so birds and wildlife can thrive?

A thorny question with grass stains

Ask a neighborhood listserv about lawns and watch tempers sprout. For some, a tight green carpet is civic virtue. For others, it’s an ecological dead zone with a fertilizer habit. Should we drop the mower for wildlife’s sake, or is that an overgrown idea? Let’s zoom out, sift the evidence, and try not to start a HOA uprising.

A person mowing a grassy lawn with a hand push lawn mower.
Image by Chatswood Gardencare via Flickr.

The case for mowing less

Lawns are huge – so small changes matter

In the U.S., lawns cover a staggering area and are often cited as the largest single irrigated “crop.” That means tiny improvements in millions of yards can add up to real habitat gains. Earth Observatory

Less mowing can mean more bugs – and birds eat bugs

An experimental study in Massachusetts tested weekly, biweekly, and every-3-weeks mowing. Two takeaways: mowing less often boosted lawn flowers like clover and dandelions, and bee communities responded. The richest mix of bee species appeared at 3 weeks, while the highest bee abundance showed up at 2 weeks. Translation: giving flowering “weeds” a breather can feed pollinators, which fuels the food chain for nestling birds. ScienceDirectUSFS Research & Development

Native plants supercharge yards for birds

Here’s the big lever: swapping even part of your lawn for native shrubs, perennials, or a small meadow can dramatically increase insect biomass, which is what most baby birds actually eat. A landmark study found that yards dominated by non-native plants could not support sustainable breeding of insect-eating birds, while native plantings did. PNAS

A Painted Bunting perched on a thin-stemmed plant with red flowers.
Image by Pedro Lastra via Flickr.

Meadows and “messy corners” help biodiversity

Replacing short-mown grass with small urban meadow patches increases plant and invertebrate diversity, with spillover benefits for everything from goldfinches to wrens. These gains show up even at pocket scale in cities. PMC

The case against tossing the mower entirely

Health and safety are real considerations

Ticks like shade, humidity, and tall vegetation. Public health guidance consistently recommends keeping grass short in high-use areas, removing leaf litter, and creating simple barriers between lawn and woods to make yards less tick-friendly. That doesn’t mean you need a putting green – it does mean think carefully about where you let grass get long. CDCCornell CALS

In the West and other fire-prone regions, defensible space is not optional. Agencies advise keeping grasses low near structures and managing vegetation within the home ignition zone. Habitat helps birds – intact homes help people. Plan your wild bits beyond that safety buffer. NFPAFEMA

“No Mow May” has mixed evidence in the U.S.

A yard that has been left to grow with a variety of native plants and flowers.
Image by SnailWhisperer via Flickr.

You’ve seen the signs. The original high-profile study often cited to support No Mow May was retracted in 2022 due to data issues. Some extension services now suggest a “slow-mow” approach that adapts to local climates rather than a one-size-fits-all pause. The science around mowing frequency is evolving, but the safest bet is thoughtful, consistent management over catchy slogans. PeerJ

Ecology, not neglect

Letting lawn rocket to knee-high and then scalping it can stress turf, smother plants with clippings, and invite invasive weeds. If your goal is habitat, intentional plantings and steady maintenance beat one month of benign neglect followed by a roar of the mower.

The middle path: a backyard mosaic

Okay, okay, okay – you don’t have to choose between a golf fairway and a hayfield. The sweet spot is a mosaic that balances people spaces, safety, and wild corners. Think like a wren: practical, opportunistic, and tidy where it counts.

A wildlife friendly yard with a mixture of cut grass and areas of dense greenery and plants.
Image by bluebird87 via Flickr.

Keep a “clean-ring” near the house

  • Maintain a short, well-kept zone around patios, play areas, and paths. It reduces tick risk and keeps access easy. In fire country, treat this as defensible space and follow local guidance on grass height and debris. CDCNFPA

Let portions go purposefully wild

  • Beyond that inner ring, designate patches for longer growth and mow them on a relaxed schedule. If you want pollinators, a 2- to 3-week interval for traditional lawns can help lawn flowers bloom while staying manageable, or convert sections to true meadow plantings. Edge them with a crisp mown border or path so wild looks intentional, not abandoned. ScienceDirect

Trade square feet of lawn for native plants

  • Start with a strip. Swap turf for native shrubs, grasses, and perennials that bloom from early spring to late fall. Aim for structural variety – some low groundcover, some waist-high stems, a few shrubs – to maximize cover and insect production for birds. This is the single most powerful yard upgrade for breeding birds. PNAS

Water, chemicals, and clippings – go light and smart

  • If you keep lawn, mow high but not extreme, leave clippings lightly to cycle nutrients, and ditch routine pesticides. Healthy, diverse plantings reduce pest pressure naturally and keep food webs ticking.

Work with your context

  • Check local rules on lawn height and natural landscaping. Many municipalities allow managed native plantings if you keep sightlines safe and edges neat. Talk to neighbors. A small sign explaining your pollinator patch can turn skeptics into allies.

A few quick builds that birds love

A mourning dove walks on a concrete path in a yard.
Image by Sue Thompson via Flickr.
  • Shrub islands: a dense native shrub clump in a sea of turf is a lifesaver for fledglings.
  • Seed-rich corners: let coneflowers and grasses stand through winter for food and cover.
  • Water: a shallow birdbath with clean water beats any bag of seed in July.
  • Leaf litter zones: a tucked-away corner of leaves hosts the caterpillars that feed nestlings.

So…should we stop mowing?

Not entirely. But should we mow smarter – and a bit less in the right places – so birds and wildlife can thrive alongside us? Absolutely.

Here’s the verdict most of us can share: keep a safe, short inner zone where people play and homes need protection. Beyond that, trade some lawn for native plantings, try a longer mowing interval where it makes sense, and shape a yard that hums with insects in June and fledglings in July. Lawns cover a vast canvas in America – let’s paint more of it for nature, without forgetting human health and safety. Earth Observatory

Categories
Bird Debates

Are exotic pet birds ethical to own – or should the trade be banned?

Ask this on a birding page and you’ll split the room. One side sees devoted caretakers and cockatiels whistling the Mario theme. The other sees pet birds in small lives, bounced from home to home. So let’s zoom out, look at what the law says, what the science says, and where a sensible middle perch might be.

Two parrots being kept as pet birds perched on a wooden pole in a cage.
Image by David J via Flickr.

First principles in the U.S.

Two anchors shape the American debate. First, the Migratory Bird Treaty Act makes it illegal to keep native wild birds without permits. In practice, the birds you see as pets in the U.S. are non-native species, typically captive-bred. Second, the Wild Bird Conservation Act of 1992 throttled imports of wild-caught birds to ensure trade is biologically sustainable and not detrimental to species survival. That law, paired with CITES rules, shifted the U.S. market heavily toward captive breeding rather than wild harvest. U.S. Fish and Wildlife ServiceeCFR

Zoom out globally and you see more levers. The European Union’s 2005 temporary ban on wild bird imports became permanent in 2007, a move linked with lower invasion risk and fewer wild-caught birds entering consumer markets. Conservation groups still argue about side effects, but the direction of travel is clear: tighter regulation on wild-sourced trade. Conservation BiologyCITES

How many U.S. homes actually own pet birds? Roughly 6 million households according to industry surveys. Not dogs-and-cats big, but hardly niche. American Pet Products Association

The case for ethical ownership

Captive-bred, not wild-caught

If there’s an ethical lane, it starts here. After the WBCA, legal imports of wild parrots to the U.S. collapsed, and domestic breeding and adoption filled most demand. That’s better for wild populations and avoids the brutal mortality that used to shadow international trapping and transport. ScienceDirectanimalsandsociety.org

An African Grey Parrot, a bird that can talk and mimic many sounds.
Image by Emma Douglas via Flickr.

Real welfare progress is possible

Parrots are social, intelligent, and busy-minded. Kept well, they can thrive: large and complex spaces, daily social contact, foraging challenges, competent veterinary care, and guardians who understand they’re signing up for a decades-long relationship. Welfare reviews emphasize that enrichment and agency reduce problem behaviors. In short: bigger world, better bird. ScienceDirect

Conservation upside – when carefully structured

Well-regulated aviculture can create ex-situ safety nets and reduce pressure on wild stocks, especially when paired with in-range conservation. CITES and the WBCA explicitly aim for trade that is sustainable and non-detrimental, not a free-for-all. The key word is regulated. CITESeCFR

The case for a ban

Welfare red flags

Even with the best intentions, many parrots don’t get what they need. Feather-damaging behavior affects an estimated 10-17% of captive parrots in studies, a visible symptom of stress, boredom, or unmet social needs. Long lifespans mean pet birds outlive relationships, landlords, and life plans. Sanctuaries across the U.S. report heavy and rising surrender pressure. PLOSSpectrum Local News

A parrot kept as a pet bird that has plucked out its feathers.
Image by Oscar Gutierrez via Flickr.

The rescue reality

Visit a large sanctuary and you’ll see the backlog: macaws and cockatoos that screamed their way out of three homes by age ten, cockatiels bred by the hundred, conures surrendered after the honeymoon phase. Individual examples are not peer-reviewed data, but the pattern is consistent in reporting from major facilities and welfare groups. The ethical question: should we keep adding birds to a pipeline we already struggle to steward? avianwelfare.org

Disease and biosecurity

Zoonotic risk isn’t a scare story; it’s why quarantine exists. Psittacosis is uncommon but real, and CDC guidance for pet bird owners and vets is clear about hygiene, quarantine, and early treatment. Wild-caught supply chains magnify risk, which is another argument against them. CDC+1

Escapees and invasions

A monk parakeet eating berries.
Image by James Falleti via Flickr.

Escaped pets can seed feral populations. The U.S. monk parakeet story is the classic: charismatic, hardy, and capable of building massive stick nests on utility structures that can short transformers and trigger outages. Utilities and wildlife agencies spend real money managing those nests. Even where ecological harm looks limited, infrastructure conflicts are very real. APHISHouston Chronicle

And the wild is not okay

Parrots remain among the most threatened bird groups on Earth, with roughly one quarter to one third of species considered threatened depending on the analysis. Habitat loss and illegal trade both play roles. When a market rewards novelty and rarity, bans start to look less like overreach and more like a firewall. AudubonBirdLife DataZone

So…ban the trade or tighten the rules?

Okay, okay, okay – here’s the balanced perch.

  • A blanket ban on all exotic pet bird ownership would strand many well-kept, captive-bred birds in legal limbo and could push parts of the market underground.
  • Business-as-usual risks more surrenders, more welfare failures, and incentives for illegal sourcing.

The credible middle path is no wild-caught birds and high standards for captive-bred birds, with transparency and accountability baked in.

A practical playbook for policy and people

What governments can do now

  • Keep wild-caught imports closed and align with CITES scientifically. The WBCA framework is the right idea – enforce it. eCFR
  • License breeders and sellers with welfare standards: minimum enclosure sizes, enrichment plans, socialization, record-keeping, and lifetime take-back or rehoming obligations. Surprise inspections should be normal, not shocking.
  • Require traceability: microchipping or banding, disclosures of origin, and buyer education at point of sale.
  • Support sanctuaries with grants tied to standards, because they shoulder the social costs of a profitable trade.

What buyers can do – if you still want a bird in your life

Two white cockatiel birds being kept as pets in a cage.
Image by Michelle Champaz via Flickr.
  • Adopt first. There are more parrots than prepared homes. If you purchase, buy captive-bred from transparent, inspected breeders, not from vague online listings.
  • Budget for space, time, and decades. A large parrot is a long-term partner, not a seasonal hobby.
  • Design for agency. Foraging setups, flight-time where safe, social contact daily, rotating enrichment. A busy bird is a healthy bird. ScienceDirect
  • Quarantine and veterinary care. Follow CDC-style hygiene, quarantine new birds, and build a relationship with an avian vet. CDC

What bird lovers can do – without cages

  • Plant natives, add water, clean feeders, and make your windows bird-safe. You’ll enjoy wild birds being gloriously themselves on the outside of the glass.

Verdict

Should the trade in exotic pet birds be banned? Ban the wild-caught pipeline – keep it closed. For captive-bred birds, allow a tightly regulated, welfare-first pathway that puts adoption and lifetime care front-and-center and makes shoddy breeding a non-starter. That stance respects wild populations, acknowledges real human-bird bonds, and confronts the rescue backlog honestly. It’s not as punchy as an outright ban – but it’s far better for birds in the wild and birds already in our homes. U.S. Fish and Wildlife ServiceeCFRConservation BiologyPLOSCDC

Categories
Bird Debates

Should Outdoor Cats Be Banned to Protect Bird Populations?

Let’s be honest…

Few topics ruffle as many feathers on a birding page as cats.

Ask whether outdoor cats should be banned and you’ll summon a flock of opinions – some purring, some hissing.

So let’s take a deep breath, put down the pitchforks (and the laser pointers), and look at what the evidence says, what it doesn’t, and where a sensible middle perch might be.

A ginger cat looks over the bird it has killed.
Image by SmallWorldPodcast via Flickr.

The case for a ban: birds are in the firing line

There’s no way to sugar-coat the numbers. In the United States, free-roaming cats are estimated to kill 1.3–4.0 billion birds annually, with unowned cats responsible for the majority of that toll. That’s not a rounding error; it’s a tidal wave of small deaths that adds up across landscapes. Nature

Australia tells a similarly sobering story. A national analysis estimates cats (pet and feral combined) kill ~377 million birds each year – more than a million a day – with many threatened species among the casualties. nespthreatenedspecies.edu.auABC

A black and white cat lies down next to a bird it has killed.
Image by Itemfebank via Flickr.

Beyond direct predation, cats can change bird behaviour. Nesting pairs may feed chicks less when cats are nearby, and urban green spaces – those tiny lifeboats for wildlife – often host lots of cats and relatively few refuges. It’s no surprise that some conservationists push for strong restrictions, especially around sensitive habitats such as shorebird sites or small urban reserves. Animal-welfare agencies and city planners in Canberra (Australian Capital Territory) have already moved to mandatory cat containment for cats born after 1 July 2022, with full-time containment in designated suburbs. cityservices.act.gov.au

The case against a ban: complexity, culture, and cat welfare

Here’s where it gets knotty. While cats clearly kill birds, the population-level impact – particularly in the UK’s garden birds – remains contested. Some UK studies document very high numbers of prey returned by cats (tens of millions of birds annually), but translating “kills” into “declines” isn’t straightforward because habitat loss, pesticides, collisions, and climate effects are also doing heavy lifting in bird declines. In short: the headline numbers are grim, but causation can be murky at landscape scales and can vary by place and species. PLOSConservation BiologyPMC

There’s also the cultural piece. In parts of Europe, especially the UK, allowing cats outdoors is widely accepted. A blanket ban would likely be unenforceable, risk public backlash, and – crucially – could backfire for animal welfare if it drives abandonment or non-compliance. Veterinary bodies also note that policies should consider enrichment and owner behaviour, not just where a cat sleeps. The American Veterinary Medical Association (AVMA), for instance, encourages keeping owned cats indoors or under an owner’s direct control (think catios and leashes), rather than arguing for universal bans. AVMA

A cat watching out of the window for birds.
Image by Ellen F via Flickr.

And about cat welfare: you’ll often see claims that indoor cats live dramatically longer than outdoor cats. The risk profile outside (cars, fights, disease) is real, but lifespan studies are more nuanced than the internet meme suggests – indoor/outdoor cats don’t always show a clear lifespan penalty compared to strictly indoor cats, though outdoor-only cats fare worst. PLOS

What actually works right now?

If “ban all outdoor cats” is too blunt an instrument and “let them roam” is too lax, what’s the practical, evidence-based middle path? Happily, there are tools – some simple, some policy-level – that reduce bird deaths today.

1) Keep cats under control (all or part-time)

  • Full indoor life or catios/leashed walks: Gold-standard for wildlife and usually healthiest for the cat. AVMA backs this approach. AVMA
  • Curfews/seasonal containment: Night-time or breeding-season curfews can cut risk during peak fledgling chaos without asking for 24/7 changes. Canberra’s model shows how jurisdictions can phase in containment and target sensitive areas first. cityservices.act.gov.au

2) Make hunters more visible (and audible)

  • Bells: Multiple trials show bells can reduce prey brought home – roughly a third to a half fewer birds in some studies. Not perfect, but better than nothing. ScienceDirectResearchGate
A black and white cat with a belled collar.
Image by Riese Busch via Flickr.
  • High-visibility collar covers (e.g., Birdsbesafe®): Field studies in the US and UK report substantial reductions in birds killed when cats wear these brightly patterned collars – sometimes in the ~60–80% range. Quick-release safety is a must, of course. MeridianBirdsbesafe

3) Fewer new kittens on the landscape

  • Neutering reduces roaming and hunting drive in some cats, and it’s essential for limiting colony growth. Trap-Neuter-Return (TNR) can reduce numbers locally where very high sterilization rates are sustained, but evidence is mixed at city-wide scales; maintaining >70% sterilization continuously is a tall order. A fair reading: TNR is one tool, not a silver bullet. PMCAsk IFAS – Powered by EDISThe New Yorker

4) Smarter urban design (for birds)

  • Safe bird-feeding setups: Elevate feeders and keep dense cover nearby for quick getaways.
  • Window strike prevention (decals, strings, screens): If we’re serious about birds, we can’t ignore glass collisions while arguing about cats.
  • Shrubs > lawn: More structure equals more escape routes and better nesting cover.

5) Policy nudges that help without polarising

  • Microchipping and licensing improve accountability and reunite lost cats with owners (England’s new microchipping requirement kicked in 10 June 2024). GOV.UK
  • Targeted containment zones around high-value bird habitats and during critical seasons can deliver big conservation gains without dictating lifestyles everywhere. cityservices.act.gov.au

So…ban outdoor cats?

A close-up image of a brown cat.
Image by Rahul Suresh Mathew via Flickr.

Here’s the view from the fence (where the robins and wrens are perched, rolling their eyes at us):

  • A total ban is likely to be blunt, divisive, and hard to enforce. It risks alienating cat owners whose buy-in we absolutely need.
  • Doing nothing isn’t credible either, given the scale of predation documented in many places. Naturenespthreatenedspecies.edu.au

The sweet spot? Responsible containment by default, with stronger rules where the stakes are highest. That means: keep pet cats indoors or under direct control where possible; use bells or high-visibility collars if they go out; build catios (they’re basically bird blinds with cushions); and support area-based containment around sensitive sites and during fledgling season. Pair that with urban bird-friendly design and targeted, well-resourced programs for unowned cats that actually reduce colony sizes.

Final thoughts (and a friendly challenge)

Outdoor cats and wild birds didn’t sign a peace treaty, and they’re not about to. But people – bird-lovers and cat-lovers alike – can make pragmatic choices that dial the harm way down without declaring war on each other.

If you’re a birder with a cat: try a bell or a Birdsbesafe® collar cover, keep your cat in during dawn/dusk in spring, and consider a weekend project catio. If you’re a cat person who doesn’t (yet) love birds: elevate your feeders and add shrubs so fledglings have cover, and you’ll still enjoy feathered neighbours – minus the grim “gifts.”

Bans make headlines. Habits save birds. Let’s start there.

Categories
Bird Guides

Purple Martin Migration Patterns Explained

As summer draws to an end, Purple Martins are preparing to start a long migration ahead. 

Capable of travelling thousands of miles, these are resilient little birds. 

This article explores the migration patterns of Purple Martins, the importance of particular roosting sites and how you can help them.

A huge group of migrating martins flying above the trees as the sun sets.
Image by Donald Troha via Flickr.

Read on to discover more about the migration patterns of Purple Martins.

What Are Purple Martins?

No, not little purple aliens on Mars – an honest mistake from any dyslexic birder like myself. 

Instead, Purple Martins are a type of passerine songbird native to North and South America. 

While females are white, grey and brown, adult males have dark blue-purple plumage with an iridescent sheen. 

They are related to swallows and both groups belong to the family Hirundinidae

They are aerial hunters, swooping up insects on the wing. 

For me, martins and swallows are as synonymous with summer as an ice cream on the beach is. 

A Pair of Purple Martins
Image by Bonnie Ott via Flickr.

However, it’s not their beautiful plumage or summer sightings that makes the Purple Martin so special. 

Perhaps the most remarkable characteristic of this bird is its long-distance migration patterns. 

Where Do Purple Martins Migrate To?

Purple Martins are long-distant migrants.

In the summer months, Purple Martins breed in the temperate regions of North America. 

They are most populous in the eastern USA, in states such as Texas, Florida, Pennsylvania, Alabama and Louisiana. 

They can also be found, although in much smaller populations, in western United States in mountainous regions of New Mexico, Arizona, western Colorado, and Utah. 

As winter approaches, they migrate south towards the Amazon Basin in South America. 

Non-breeding populations of Purple Martins can be found in Brazil, Bolivia and Peru, with the majority of birds spending the non-breeding season in Brazil. 

A male purple martin perched on a dead branch.
Image by Howard Patterson via Flickr.

After spending a few months in South America, they begin the journey back to North America. 

A single Purple Martin can travel thousands of miles in one season – upwards of 10,000 miles. 

The Significance Of Purple Martins In Brazil

In Brazil’s Rio Negro, a small island, known locally as Ilha do Comaru, can be found.

At just 12 acres, the island isn’t large. 

However, between the months of February and April, the island plays host to approximately 250,000 Purple Martins – making Brazil’s Ilha do Comaru one of their largest known roosts

But size alone isn’t everything. 

What makes this particular roost in Brazil so special is the pivotal role it may play in the long-distance migration of these birds. 

Scientists hypothesize that Comaru could be the staging ground – a place where migrant birds stop to rest, drink, and eat – for many of the 9.3 million Purple Martins that funnel from South to North America.

Why Do Purple Martins Migrate?

Purple Martins, along with many other long-distance migrants, migrate to pursue warmer climates.

While their summer breeding grounds offer a surplus of food for fledglings, winter conditions are harsh. 

If they do not leave, freezing temperatures or high-intensity storms will most likely kill juveniles, and adult Purple Martins alike. 

In regions with stable climates, food can typically be found-year round. 

However, where there is food, so too are there predators. 

So, to maximize food intake while decreasing predation risk, migration seems to be a sensible option. 

Where do Purple Martins Roost?

Purple Martins begin arriving in North America in early spring. However, older adults may arrive as early as late-winter. 

Nest building, courtship, copulation and egg laying follows.

A female martin pokes her head out of a nest box.
Image by Jason Taylor via Flickr.

Adult Purple Martins start laying eggs in late April or May, while subadults – younger adults that have fledged the previous year – may begin nesting later in the summer, typically in June or July.

After hatching, fledging occurs. During this time, both parents will continue feeding the young for up to two weeks. 

Finally, the new juvenile Purple Martins, together with adults and subadults, begin congregating at roost sites. 

Often, roosts are chosen on their proximity to water; as this provides ample opportunities for drinking, bathing, and foraging on abundant insects

More and more flocks of martins gather at these roosts to spend the night. 

After roughly 4 weeks, groups of Purple Martins begin leaving roosts to start their migration back to South America. 

In Brazil, many of this species roost in urban and suburban areas. Roosts can be found in small parks or human-made structures such as bridges and pipes. 

North America’s Largest Purple Martin Roost

The largest known Purple Martin roost in North America can be found on Bomb Island.

A large roost of martins in a dead tree.
Image by Jim Edwards via Flickr.

Located on Lake Murray in South Carolina, Bomb Island is just 12-acres of land. 

Despite its size, Bomb Island is the roosting site for hundreds of thousands of martins every summer. 

Some estimates suggest as many as one million Purple Martins roost here!

The best time to see these birds on Bomb Island is from late June through early August, with the highest number of birds appearing from mid-to-late July. The birds are most active during the early morning or evening. 

The size of the roost can be so large, it is often picked up on weather radars. 

How You Can Help

Besides a few scattered populations, most Purple Martins in North America need hollow structures to nest.

Historically, natural cavities, such as tree holes, offered perfect nesting conditions. 

However, with an exploding human population, deforestation soared and nesting trees were lost. 

the
Image by Oakely Originals via Flickr.

At the same time, competition with introduced species – such as the aggressive European starling – also lead to population decreases. 

As a result, Purple Martins have become near 100% reliant on human intervention. Which seems almost ironic. 

Are we humans completely responsible for this change in nesting behavior? Or did these birds make an informed choice to switch to human-made structures? Honestly, I’m not sure. 

What I do know is that for a Purple Martin to successfully nest in North America, especially in the East, they will most likely need a human-made structure. 

The most common structures are “condomoniums” – a specific birdhouse designed to house multiple bird families in separate compartments. This is vital, as the roosts of these species are highly social.  

However, bird houses aren’t the only solution. 

An easy, and often much cheaper, option is to hang hollowed-out gourds – a tradition dating back to Native American tribes. 

Final Thoughts 

Purple Martins are the largest member of the swallow family in North America.

They breed in North America and migrate to South America for the winter. A round-trip migration for these birds may be as long as 10,000 miles. 

The majority of Purple Martins go to Brazil during winter, with many stopping off at the small Brazilian island of Ilha do Comaru. 

In North America, they roost in large colonies – the biggest containing up to an estimated one million birds. 

This swallow species is reliant on human-made structures to nest. You can help by erecting specific bird houses or simple, hollowed-out gourds. 

A Purple Martin perched on top of a thick stick.
Image by Howard Patterson via Flickr.
Categories
Feathered Facts

10 Fascinating Facts About the American Robin

The American Robin (scientific name: Turdus migratorius) is a classic and beloved bird. Although a familiar sight in backyards across North America, its charming red breast and sweet whistling song are always a delight to witness!

American Robin Perched
Image by Gavin Edmondstone via Flickr.

The American Robin is usually associated with the first sign of spring, but this bird species is found across much of North America all year round. They breed in areas from Alaska and Canada down to Mexico, and they stay the whole year in most areas south of Canada.

Although common backyard birds might not be as exciting as rarer finds, they all have fascinating life histories. Here at Nest Box Live, we like to shine the spotlight on familiar birds unveiling surprising facts you’re unlikely to have heard before!

Here are some fascinating facts about the American Robin – we know some of these will surprise you!

1. They can raise up to three successful broods each year

Imagine having babies not just once a year, but up to three times! For the American Robin, this is a reality.

Their drive to do this is likely tied to the low survival rate of their young. Only about 40% of nests successfully fledge chicks, and just 30% of fledged chicks make it to winter. Of those, only half will survive to the following year

A comparison picture of an American Robin in nestling and fledgling stage.
An American robin nestling (left) and fledgling (right). Left image by Craig Chaddock via Instagram and Flickr. Right image by Gillian Floyd via Flickr.

2. They can live to a ripe old age – but most don’t

The oldest known wild American Robin lived at least 13 years and 11 months, which is impressive for a songbird.

However, most robins live only one to two years. Predation from birds of prey and domestic cats, along with pesticide exposure, are the biggest threats to their survival.

3. American robins carry a unique spiritual meaning

Due to its association as the harbinger of spring, the American robin symbolizes the end of one phase and the start of a new beginning. After surviving the winter, the robin appears again, singing its beautiful song. This acts as a reminder to live presently and not to dwell on the past or worry about the future.

As a bird steeped in folklore, there are many superstitions tied to robins, including:

  • Robins feeding in your yard means important news is coming.
  • A robin perched on your roof protects your home from lightning.
  • Robins singing near a wedding bless the couple with lifelong love.

4. Females look different from males and can be harder to identify

Three photos of different American Robins. On the left is an adult male, in the middle is an adult female and on the right is a juvenile.
An adult male American robin (left), adult female (middle) and juvenile (right). Left image by Larry Reis via Flickr. Middle image by Ludo Bogaert via Flickr. Right image by Chip Wiggins via Flickr.

The males are the brightest and easiest to spot: they have a vivid rusty-orange belly, a dark-gray or black head and a bright yellow beak. Female American robins, and young males, are more pale, with lighter orange bellies and gray heads.

Juvenile robins are also less distinct than adult males: their bellies are lighter orange or white with black spots, and their wings are also mottled.

Differences in coloration can also be due to location, as western populations are often paler than eastern populations. There are seven subspecies of American robin across North America, with different body size and plumage. The San Lucas subspecies is the most distinct with buffy, not orange, underparts.

5. There are rare albino American robins

Albinism and leucism (partial albinism) occur when birds lack the pigment melanin, making them completely or partially white.

For an unknown reason, there are more albino or leucistic American robins than any other wild bird species in North America. While occurrence of leucism in other bird species rarely exceeds 1% of populations, around 8% of American robins display albinism or leucism.

A leucistic robin perched on a tree.
Image by Mike Nolen via Flickr.

Have you been lucky enough to spot a rare albino American robin? Let us know in the comments below!

6. The American robin song is a string of clear whistles 

The song of the American robin is a series of about ten clear whistles that rise and fall in a steady rhythm. They’ll sometimes shorten this song to just a few notes.

Click on the play button below to hear their song:

Stanislas Wroza, XC1012677. Accessible at www.xeno-canto.org/1012677.

Robins also make distinct calls:

  • A soft cuck or tuk when communicating 
  • A repeated chirr that rises in volume, sounding like a chuckle, when there’s a mild threat
  • A high-pitched seee whistle when an aerial predator is nearby

7. Their eggs are a distinctive sky-blue color

The color of American robin eggs is so distinctive that the color has its own named shade, “robin’s egg blue”. This is the trademarked shade used by Tiffany & Co.

The nest of an American Robin with three bright blue eggs.
Image by Jay Gao via Flickr.

Their eggs are unspotted and 1.1-1.2 inches long. The female robin lays clutches of around 3-5 eggs.

The unique color of the American robin’s eggs comes from pigments in the mother’s blood. A 2016 study suggests the blue pigment may protect the eggs from harmful UV radiation. 

8. Females build the nests

Robins usually build their nests lower down in trees or shrubs, but they sometimes choose locations as high as tree tops. They occasionally build their nests on man-made structures like window sills and building ledges.

The female American robin builds an open cup-shaped nest from grass and twigs, using mud to help bind the structure together.

The male assists by bringing nesting materials and defending the territory. Once the eggs hatch, both parents share feeding duties.

9. Their diet can put them at risk

American robins are often spotted foraging on lawns for worms – these make up a large part of their diet. They rely completely on their sharp eyesight to spot worms on the ground, and do not use vibrations, odors or sounds to sense their meal.

But, eating worms can be dangerous for robins.

An American robin eating a worm from a lawn.
Image by Mason Maron via Flickr & Instagram

When pesticides are sprayed on lawns, the chemicals coat the feathers of a foraging robin and are ingested by the bird during preening. These chemicals also accumulate in worms, and can be toxic when eaten.

10. It is not uncommon to see a drunk robin!

Before you begin picturing robins stumbling out of bars, let me clarify – it’s fermented berries that get them drunk, not pints of beer.

In addition to worms, robins eat plenty of wild fruit and berries. In late winter when berries thaw and ferment, yeast converts their sugars into alcohol. The robins ingest these – et voilà – drunk robins!

Signs of intoxication include stumbling, erratic flight, and even crashing into windows.