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Cornell Lab of Ornithology

@cornellbirds.bsky.social
3.1K followers 11 following 246 posts

The Cornell Lab of Ornithology is a world leader in the study, appreciation, and conservation of birds and biodiversity. birds.cornell.edu/home/ (White-breasted Nuthatch by Hannah Criswell / Macaulay Library)

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Cornell Lab of Ornithology @cornellbirds.bsky.social · 23/09/2026
Dudley Edmondson has created a biodiverse space that's a magnet for regional birds & a favorite stopover for migrants along the Great Lakes. As a professional author & photographer he'll inspire us with his imagery & stories of his favorite visitors. RSVP: cornell.zoom.us/webinar/regi...
Gray and cream bird with a slight touch of yellow on its wing base. Text reads: FREE WEBINAR with Dudley Edmondson. Inviting Birds In: Fall Migration in Duluth, Minnesota. Sept. 30 at 7:30 p.m. ET / 4:30 p.m. PT. Yellow-rumped Warbler  © Linn H / Macaulay Library
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Cornell Lab of Ornithology @cornellbirds.bsky.social · 22/09/2026
BIRD QUIZ: Here is a bird photographed in California in early September. Do you know what species it is? Leave your answer in Comments and we'll post ours at the end of the day. Thanks to Quinn Diaz for sharing this photo with eBird and the Macaulay Library archive.
Image description: A small, long-tailed songbird perched atop a charred vertical stick. The bird is grayish above and pinkish-brown below. Text on image: Mystery Bird, Avis ignota © Quinn Diaz / Macaulay Library, Cornell Lab.
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Cornell Lab of Ornithology @cornellbirds.bsky.social · 19/09/2026
Scroll break! Stop for a few moments and get lost in this murmuration of Metallic Starlings in Queensland, Australia.
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Cornell Lab of Ornithology @cornellbirds.bsky.social · 18/09/2026
From the fastest dive to the largest wingspan, meet remarkable raptors from around the world! 🦅 Get a sneak peek at our upcoming Wonderful World of Raptors course with this free poster, illustrated by Joel Popp. Download and print your free copy at the link below: dl.allaboutbirds.org/raptor-poster
dl.allaboutbirds.org
Wonderful World of Raptors Poster Download
Do you know the largest raptor? What about the smallest? Explore fun raptor facts from around the world in this free, downloadable poster.
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Cornell Lab of Ornithology @cornellbirds.bsky.social · 15/09/2026
BIRD QUIZ: Here is a bird photographed in Nova Scotia in early September. Do you know what species it is? Leave your answer in Comments and we'll post ours at the end of the day. Thanks to Heather Michaud for sharing this photo with eBird and the Macaulay Library archive.
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Cornell Lab of Ornithology @cornellbirds.bsky.social · 14/09/2026
Hummingbirds move too fast for most of us to see clearly. In a new Wild Birds Revealed video, filmmakers Tim and Russell Laman slow things down for an up-close look at Costa’s and Anna’s Hummingbirds—their flight, feeding, and relationship with flowers. Watch: bit.ly/4x3tn71
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Cornell Lab of Ornithology @cornellbirds.bsky.social · 12/09/2026
Free Birds of the World Webinar! Diversity & Conservation of the World's Bustards, presented by members of the Bustards Without Borders team. The team just released a new Multi-species Action Plan for bustards, which grants new protections to these iconic species. birdsoftheworld.org/bow/news/bwb...
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Cornell Lab of Ornithology @cornellbirds.bsky.social · 08/09/2026
BIRD QUIZ: Here is a bird photographed in Texas in September 2025. Do you know what species it is? Leave your answer in Comments and we'll post ours at the end of the day. Thanks to Harlan Stewart for sharing this photo with eBird and the Macaulay Library archive.
Image description: A gray-and-white tern in flight against a gray background. Text on image: Mystery Bird, Avis ignota © Harlan Stewart / Macaulay Library, Cornell Lab.
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Cornell Lab of Ornithology @cornellbirds.bsky.social · 06/09/2026
Join scientific illustrator Liz Clayton Fuller @ipaintbirbs.bsky.social on September 13 for a workshop that's sure to be a hoot! 🦉🎨✨ Learn to bring your owl illustrations to life with helpful guidance from Liz. Buy your tickets soon! Registration is limited: academy.allaboutbirds.org/live-event/i...
academy.allaboutbirds.org
Illustrating Owls with Liz Clayton Fuller | Bird Academy • The Cornell Lab
Owls! They’re enigmatic, mysterious, and a lot of fun to draw! Learn to draw owls and then add paint to your sketches with friendly guidance and inspiration ...
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Cornell Lab of Ornithology @cornellbirds.bsky.social · 04/09/2026
Using the habitat clues in this video, can you guess which birds will be featured in our upcoming videos from Wild Birds Revealed? Wildlife filmmakers Tim and Russell Laman use stunning close-up footage to reveal what makes familiar birds extraordinary. Drop your guesses in the comments.
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Cornell Lab of Ornithology @cornellbirds.bsky.social · 02/09/2026
Free webinar alert! RSVP to learn strategies to protect and increase the biodiversity of your yard for native butterflies, moths, and other beneficial insects. All registrants will receive a copy of the recording after the event. RSVP: cornell.zoom.us/webinar/regi...
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Cornell Lab of Ornithology @cornellbirds.bsky.social · 01/09/2026
BIRD QUIZ: Here is a bird photographed in Pennsylvania in early September 2024. Do you know what species it is? Leave your answer in Comments and we'll post ours at the end of the day. Thanks to Peter Hamner for sharing this photo with eBird and the Macaulay Library archive.
Image description: A brown-and-buff raptor in flight against a green background. Text on image: Mystery Bird, Avis ignota © Peter Hamner / Macaulay Library, Cornell Lab.
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Cornell Lab of Ornithology @cornellbirds.bsky.social · 26/08/2026
Fall Migration is already in full swing! Check out birdcast.org for live maps, migration alerts, and forecasts, and sign up for Email Migration Alerts (birdcast.org/migration-to... Dim lights at night, Treat your window by day to help migrating birds avoid glass collisions.
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Cornell Lab of Ornithology @cornellbirds.bsky.social · 25/08/2026
BIRD QUIZ: Here is a bird photographed in Arizona in mid-August. Do you know what species it is? Leave your answer in Comments and we'll post ours at the end of the day. Thanks to Melissa Mancuso for sharing this photo with eBird and the Macaulay Library archive.
Image description: A small songbird perched on a small branch. The bird has gray upperparts, whitish underparts, and a red-and-black head. Text on image: Mystery Bird, Avis ignota © Melissa Mancuso / Macaulay Library, Cornell Lab.
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Cornell Lab of Ornithology @cornellbirds.bsky.social · 24/08/2026
Shorebirds often sport similar shapes and patterns, which makes their size one of the most important clues to help with an ID. Find out more and learn what to look for with this free downloadable guide, including full-color photos, and a size reference chart: dl.allaboutbirds.org/shorebird-po...
dl.allaboutbirds.org
A Shorebird ID Guide to Print at Home!
Become familiar with the diversity of shorebirds from plovers to peeps, and more with this Shorebird ID Guide.
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Cornell Lab of Ornithology @cornellbirds.bsky.social · 11/08/2026
BIRD QUIZ: Here is a bird photographed in Colorado in early August 2025. Do you know what species it is? Leave your answer in Comments and we'll post ours at the end of the day. Thanks to Rachel Leggett for sharing this photo with eBird and the Macaulay Library archive.
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Cornell Lab of Ornithology @cornellbirds.bsky.social · 04/08/2026
BIRD QUIZ: Here is a bird photographed in Virginia in early August 2021. Do you know what species it is? Leave your answer in Comments and we'll post ours at the end of the day. Thanks to Martina Nordstrand for sharing this photo with eBird and the Macaulay Library archive.
Image description: A heron standing in shallow water with a small crab in its bill. The bird is mostly brown, with a streaked throat and spotted upperparts. Text on image: Mystery Bird, Avis ignota © Martina Nordstrand / Macaulay Library, Cornell Lab.
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Cornell Lab of Ornithology @cornellbirds.bsky.social · 28/07/2026
BIRD QUIZ: Here is a bird photographed in Montana in mid-July. Do you know what species it is? Leave your answer in Comments and we'll post ours at the end of the day. Thanks to Jan Thom for sharing this photo with eBird and the Macaulay Library archive.
Image description: A long-billed shorebird with intricately patterned dark upperparts and a white belly. The bird is perched on a tree stump in front of a greenish background. Text on image: Mystery Bird, Avis ignota © Jan Thom / Macaulay Library, Cornell Lab.
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Cornell Lab of Ornithology @cornellbirds.bsky.social · 21/07/2026
BIRD QUIZ: Here is a bird photographed in Alberta in mid-July. Do you know what species it is? Leave your answer in Comments and we'll post ours at the end of the day. Thanks to Ayden Valkenburg for sharing this photo with eBird and the Macaulay Library archive.
Image description: A waterbird sitting on blue-gray water with faint ripples. The bird is mostly black, with yellow plumes behind the eye and chestnut flanks. Text on image: Mystery Bird, Avis ignota © Ayden Valkenburg / Macaulay Library, Cornell Lab.
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Cornell Lab of Ornithology @cornellbirds.bsky.social · 17/07/2026
If you're in an area that's impacted by the recent wildfires, you may be curious about how smoke impacts birds as well. Scientists have only recently begun studying smoke's effect on birds, read some of what they've found so far: www.allaboutbirds.org/news/is-the-...
allaboutbirds.org
Is the Smoke from Wildfires Dangerous to Birds?
A Barn Owl hunting in the morning fog and smoke of California wildfires. Photo by Sam McMillian / Birdshare. Smoke can be hazardous to birds just as it is to people, due to the mix of fine particul...
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Cornell Lab of Ornithology @cornellbirds.bsky.social · 15/07/2026
Did you know you can upload your field notes/sketches along with your eBird checklists? We love coming across these beautiful artistic snapshots from your birding adventures in Macaulay Library. Check out our Bird Academy sale on bird art courses + free webinars: academy.allaboutbirds.org
sketches of a blue and white bird with black wings and field notes. Text reads: Tree Swallow. Tachycineta bicolor. © Parker S / Macaulay Library.illustration of a brown bird with streaky underside and bold black stripe on its head. Text reads: Ovenbird. Seiurus aurocapilla. © Su Delve / Macaulay Library.Sketch and field notes of a Black Vulture and Merlin. Text reads: Black Vulture. Coragyps atratus. © Michael Kensinger / Macaulay Library.sketches and water color paintings of a streaky brown bird with field notes written. Text reads: Lark Sparrow. Chondestes grammacus. © Brian Small / Macaulay Library.
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Cornell Lab of Ornithology @cornellbirds.bsky.social · 14/07/2026
BIRD QUIZ: Here are a bird and its chick photographed in Michigan in early July. Do you know what species they are? Leave your answer in Comments and we'll post ours at the end of the day. Thanks to Matthew Dolkart for sharing this photo with eBird and the Macaulay Library archive.
A pale shorebird with a chick directly in front of it. The adult is sandy brown above and white below, with a black collar. The foreground and background are blurred brown, matching the adult’s upperparts. Text on image: Mystery Bird, Avis ignota © Matthew Dolkart / Macaulay Library, Cornell Lab.
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Cornell Lab of Ornithology @cornellbirds.bsky.social · 12/07/2026
Did you know that the warblers we see today in North America don’t always get their bold yellow colors from their own ancestors, but from other warbler species via hybridization? To celebrate warblers we’ve got a paint by numbers free downloads available: dl.allaboutbirds.org/warbler-pain...
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Cornell Lab of Ornithology @cornellbirds.bsky.social · 09/07/2026
New Living Bird magazine article: how a writer’s experiences with watching owls helped her recover from a traumatic brain injury. New studies are showing how birding can affect brain structure & foster a sense of well-being. www.allaboutbirds.org/news/birding...
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Cornell Lab of Ornithology @cornellbirds.bsky.social · 07/07/2026
BIRD QUIZ: Here is a bird photographed in Colorado in early July 2021. Do you know what species it is? Leave your answer in Comments and we'll post ours at the end of the day. Thanks to Johanna Beam for sharing this photo with eBird and the Macaulay Library archive.
[Image description: A brown-and-white chickenlike bird standing in front of a green background. Text on image: Mystery Bird, Avis ignota © Johanna Beam / Macaulay Library, Cornell Lab.]
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Cornell Lab of Ornithology @cornellbirds.bsky.social · 30/06/2026
BIRD QUIZ: Here is a bird photographed in early June in Wisconsin. Do you know what species it is? Leave your answer in Comments and we'll post ours at the end of the day. Thanks to Jonathan Fisher for sharing this photo with eBird and the Macaulay Library archive.
[Image description: A small songbird clinging to a vertical green grass stem. The bird has a heavy, thick bill and prominent yellow on the face and breast. Text on image: Mystery Bird, Avis ignota © Jonathan Fisher / Macaulay Library, Cornell Lab.]
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Cornell Lab of Ornithology @cornellbirds.bsky.social · 28/06/2026
Behind the scenes tour for our Living Bird magazine production! The Summer issue features bright warblers, Red Cockaded Woodpeckers & more! This quarterly magazine is available in print only to our members, the articles are also free online! Become a member join.birds.cornell.edu/page/150611/...
Living Bird magazine spread with a closeup of a bright yellow bird. Text reads: A behind-the-scenes sneak peek at the newest issue of the Living Bird Magazine. elements of a magazine page laid out in layers of black, blue, red, yellow. Text reads: Black + Cyan + Magenta + Yellow = a colorful Rufous-necked Hornbill. stacks of open magazine pages. Text reads: Freshly printed spreads waiting to be cut. stacks of upwardly curled magazines with photos of a yellow bird poking out of a tree. Text reads: Getting ready to meet you all soon!
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Cornell Lab of Ornithology @cornellbirds.bsky.social · 17/06/2026
Grasslands support people’s livelihoods, Indigenous cultures & ecosystem functions. But they are disappearing rapidly. More than 1/2 of bird species that depend on grasslands are in steep decline. We’re proud to be part of America’s Grasslands Coalition, learn more: grasslanders.org
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Cornell Lab of Ornithology @cornellbirds.bsky.social · 16/06/2026
BIRD QUIZ: Here is a trio of birds photographed in early June in Virginia, north of their normal range. Do you know what species it is? Leave your answer in Comments and we'll post ours at the end of the day. Thanks to Anne Bielamowicz for sharing this photo with eBird and the Macaulay Library.
[Image description: Three ducks in flight against a blue sky. The birds are patterned in black, white, chestnut, and gray. Text on image: Mystery Bird, Avis ignota © Anne Bielamowicz / Macaulay Library, Cornell Lab.]
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Cornell Lab of Ornithology @cornellbirds.bsky.social · 09/06/2026
BIRD QUIZ: Here is a bird photographed in Alberta in mid-June 2023. Do you know what species it is? Leave your answer in Comments and we'll post ours at the end of the day. Thanks to Sydney Mohr for sharing this photo with eBird and the Macaulay Library archive.
[Image description: A small songbird perched on a lichen-covered branch. The bird has a gray hood, olive upperparts, and yellow underparts. Text on image: Mystery Bird, Avis ignota © Sydney Mohr / Macaulay Library, Cornell Lab.]
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Cornell Lab of Ornithology @cornellbirds.bsky.social · 04/06/2026
The final event of Welcome Back Birds is coming up. Cornell Lab experts will talk about how to bring more kinds of birds to your yard & how to keep them safe & enjoy them all summer long. Register here: hubs.la/Q048D9J90 If you registered for April/May’s live events, you don't need to re-register.
small, off-white bird with dark brown streak over its eye and a copper head stands on a sunflower with a worm in its beak. Text reads: Welcome Back Birds! How To Support Birds All Summer Long. Thursday, June 18 1-2pm ET / 10-11am PT. Chipping Sparrow © Cheryl Taylor / Macaulay Library.
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Cornell Lab of Ornithology @cornellbirds.bsky.social · 02/06/2026
BIRD QUIZ: Here is a bird photographed in Nunavut in early June 2019. Do you know what species it is? Leave your answer in Comments and we'll post ours at the end of the day. Thanks to Paul Jones for sharing this photo with eBird and the Macaulay Library archive.
[Image description: A bright red shorebird resting on calm turquoise water, with its image reflected in the water. The bird has a white face and a mostly yellow bill. Text on image: Mystery Bird, Avis ignota © Paul Jones / Macaulay Library, Cornell Lab.]
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Cornell Lab of Ornithology @cornellbirds.bsky.social · 27/05/2026
Our Bartels Science Illustration Program is calling for applicants! This is a full-time, paid, in-person appointment. Residency begins in the fall and spans 6–12 months. Please note, Visa sponsorship is not available. Deadline for applications is May 29, 2026. www.birds.cornell.edu/illustrators/
Tree Swallow - blue bird with dark gray wings and white underparts. Text reads: Bartels Science Illustration Program Artist Residency. We're Hiring! May 29th Application Deadline. Swipe to see criteria or visit birds.cornell.edu/illustrators. Tree Swallow by Charlotte Holder '22. Tree Swallow - blue bird with dark gray wings and white underparts in the corner. Text reads: Application deadline: May 29, 2026. Duration: Fall 2026-Summer 2027. Residency duration: 6-12 months. In-person position in Ithaca, New York. This is a full-time, paid temporary appointment. Please note Visa sponsorship is not available for this position.
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Cornell Lab of Ornithology @cornellbirds.bsky.social · 26/05/2026
BIRD QUIZ: Here is a bird photographed in Michigan in mid-May. Do you know what species it is? Leave your answer in Comments and we'll post ours at the end of the day. Thanks to Jocelyn Anderson for sharing this photo with eBird and the Macaulay Library archive.
[Image description: A small songbird perched on a thin horizontal branch and surrounded by fresh green foliage. The bird is boldly patterned in yellow, black, gray, and white. Text on image: Mystery Bird, Avis ignota © Jocelyn Anderson / Macaulay Library, Cornell Lab.]
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Cornell Lab of Ornithology @cornellbirds.bsky.social · 23/05/2026
Warblers are exhilarating to ID, but they can also be a real challenge! Brush up on our tips for identifying these three easy to confuse birds, Palm Warblers, Cape May Warblers, and Prairie Warblers. Then test what you know with a re-playable practice quiz: academy.allaboutbirds.org/how-to-id-pa...
academy.allaboutbirds.org
How to ID Palm Warblers, Cape May Warblers, and Prairie Warblers
These three sunny warbler species might be tricky to tell apart. Pick up our identification tips for Palm Warblers, Cape May Warblers, and Prairies Warblers. Then, train your ID skills with a replayable quiz!
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Cornell Lab of Ornithology @cornellbirds.bsky.social · 14/05/2026
Join us for a video premiere and live Q&A on May 22 at 2:00 p.m. EDT! 📣 🐦 Celebrate the joy of spring birding and enjoy a video following Lab staff into our local woods. Co-hosts Kevin McGowan and Samantha Hauser will introduce the premiere and answer your questions. Can’t wait to see you there!
academy.allaboutbirds.org
Video Premiere: Walk in the Woods with Kevin McGowan | Bird Academy • The Cornell Lab
Join us live, Friday, May 22, 2:00 p.m. EDT / 11:00 a.m. PDT Kevin McGowan searches the woods along with staffers on one of his daily walks. A Live Video Pr ...
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Cornell Lab of Ornithology @cornellbirds.bsky.social · 12/05/2026
BIRD QUIZ: Here is a bird photographed in Illinois in early May. Do you know what species it is? Leave your answer in Comments and we'll post ours at the end of the day. Thanks to Marky Mutchler for sharing this photo with eBird and the Macaulay Library archive.
[Image description: A gray-and-white songbird perched on a thin branch, with bright green leaves below the bird and pink flowers behind it. Text on image: Mystery Bird, Avis ignota, © Marky Mutchler / Macaulay Library, Cornell Lab.]
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Cornell Lab of Ornithology @cornellbirds.bsky.social · 06/05/2026
Warblers are exciting heralds of spring, but they can be notoriously tricky to ID! Pick up our quick, downloadable photo guide featuring eastern, western, and widespread warbler species of the U.S. and Canada to compare warblers in their spring plumage: dl.allaboutbirds.org/free-warbler...
dl.allaboutbirds.org
Free Warbler ID Guide PDF
Get help with Warbler ID and learn what to look for with these free, downloadable warbler photo guides.
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Cornell Lab of Ornithology @cornellbirds.bsky.social · 05/05/2026
BIRD QUIZ: Here is a bird photographed in Kentucky in early May 2022. Do you know what species it is? Leave your answer in Comments and we'll post ours at the end of the day. Thanks to Dorian Anderson for sharing this photo with eBird and the Macaulay Library archive.
[Image description: A songbird perched on a lichen-covered diagonal branch against a green background. The bird has brown upperparts and pale, unstreaked underparts. Text on image: Mystery Bird, Avis ignota, © Dorian Anderson / Macaulay Library, Cornell Lab.]
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Cornell Lab of Ornithology @cornellbirds.bsky.social · 04/05/2026
More than 373 MILLION birds are forecast to fly across the East Coast and eastern Midwest tonight. Help keep them safe and on track by turning off nonessential lights from 11 PM to 6 AM. Learn more about migration, window safety, and sign up to get alerts: birdcast.org/migration-to...
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Cornell Lab of Ornithology @cornellbirds.bsky.social · 01/05/2026
Save 40% on Warbler ID learning!📣Brush up on Warbler ID with our self-paced, online course. You'll learn to confidently ID 51 warblers from across the U.S. and Canada and start greeting these delightful, migratory birds by name. academy.allaboutbirds.org/product/be-a...
academy.allaboutbirds.org
Be a Better Birder: Warbler Identification | Bird Academy • The Cornell Lab
The most comprehensive online course on warblers. Covers all 51 species in the U.S. and Canada and gives you practice tools to prepare you for the field.
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Cornell Lab of Ornithology @cornellbirds.bsky.social · 30/04/2026
1 day. 1 team. 1 epic bird quest. Big Day is back on May 9! Team Sapsucker will split up to count birds in Appalachia & the Maya Forest in Guatemala, spotlighting the “sister landscapes” migratory birds depend on. Help us beat last year's $1M+ raised for conservation: dl.allaboutbirds.org/bigday2026
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Cornell Lab of Ornithology @cornellbirds.bsky.social · 28/04/2026
BIRD QUIZ: Here is a bird photographed in South Carolina in mid-April. Do you know what species it is? Leave your answer in Comments and we'll post ours at the end of the day. Thanks to Pramod Prabhu for sharing this photo with eBird and the Macaulay Library archive.
[Image description: A songbird perched on a thin horizontal branch against a green background. They bird has yellow underparts, olive upperparts, and black on the head. Text on image: Mystery Bird, Avis ignota, © Pramod Prabhu / Macaulay Library, Cornell Lab.]
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Cornell Lab of Ornithology @cornellbirds.bsky.social · 20/04/2026
Our next Welcome Back Birds live session is coming up—join Cornell Lab experts to explore bird migration & can’t-miss spectacles near you. Register once to access May + June events, the April recording (all about bird songs), bonus resources & a discount on Bird Academy courses! hubs.la/Q048D9J90
[Image description: Bright blue bird with crimson and gold stripes on wings flying. Text reads: Welcome Back Birds! Thursday, May 14 1-2PM ET / 10-11AM PT. Bird Migration in your backyard. Photo credit: Blue Grosbeak © Macaulay Library]
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Cornell Lab of Ornithology @cornellbirds.bsky.social · 19/04/2026
The results are in, 10/10 cats love our new video: Learn 10 Bird Songs of Spring—Common Species Across North America. Humans can learn to ID some early spring arrival bird songs by watching the full video: www.youtube.com/watch?v=y_Qt... & cats can reconnect with nature safely from your living room!
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Cornell Lab of Ornithology @cornellbirds.bsky.social · 18/04/2026
What's your ideal nest? A cavity like a bluebird? Perching in an open-cup nest like a Northern Cardinal? Or bobbing in nest made from floating vegetation, like a Common Gallinule? We designed a special quiz tells you where you’d nest if you were a bird: academy.allaboutbirds.org/whats-your-i...
A Common Gallinule sitting on its nest that is made from a pile of marsh reeds that have been piled up on the water’s edge among more reeds. Words overlaying the image read “What is your ideal nest?” Photo credit: Common Gallinule © Martha Cartwright / Macaulay Library.A nest made of grasses in a spiraling spherical shape that looks like a stereotypical nest tilted 90 degrees on its side. A bird is looking out from the side entrance hole. Words overlaying the image read “Take our fun quiz!” Photo credit: White-browed Sparrow-weaver © Eelco van Riel / Macaulay Library
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Cornell Lab of Ornithology @cornellbirds.bsky.social · 15/04/2026
Peak spring migration is fast approaching & with it comes a serious threat to birds. By making simple changes to your home or building, you can help protect birds & support their incredible journeys. Visit www.stopbirdcollisions.org to learn how to make glass safer & reduce light pollution.
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Cornell Lab of Ornithology @cornellbirds.bsky.social · 14/04/2026
BIRD QUIZ: Here is a bird photographed in Hawaii in early April. Do you know what species it is? Leave your answer in Comments and we'll post ours at the end of the day. Thanks to Robert Hollyer for sharing this photo with eBird and the Macaulay Library archive.
[Image description: A songbird perched on a horizontal branch with lichen-covered branches in the background. The bird is yellow, white, and gray, with a large bill. Text on image: Mystery Bird, Avis ignota, © Robert Hollyer / Macaulay Library, Cornell Lab.]
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Cornell Lab of Ornithology @cornellbirds.bsky.social · 13/04/2026
For years researchers have been curious about an interesting trait of Red-breasted Nuthatches. This species add a curious substance to their nesting holes. It wasn’t until 2024, that they’ve been able to test their theories and publish an answer. www.allaboutbirds.org/news/why-nut...
allaboutbirds.org
Why Do Nuthatches Coat Their Nest Entrances With Sap?
A simple series of experiments looked into why Red-breasted Nuthatches use sticky conifer resin to defend against nest predators and competitors.
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Cornell Lab of Ornithology @cornellbirds.bsky.social · 11/04/2026
Each spring, migratory birds travel thousands of miles—only to face deadly threats in our cities. Over 1B die in the U.S. yearly from window collisions. Dim lights at night. Treat glass by day. These simple steps save lives. Learn more: www.stopbirdcollisions.org/solutions/
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