Cornell Lab of Ornithology

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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)

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.

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

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.

dl.allaboutbirds.org

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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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.

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.

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.

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.

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...

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.

dl.allaboutbirds.org

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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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.

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.

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.

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.

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.]

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.]

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.]

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.]