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At one time or another, everyone asks the question, “What is that bird?”

Finding the answer can be remarkably challenging. Part of the mission of the Cornell Lab of Ornithology is to help people find that answer. We know it is hard to figure out the name of the bird you saw when sorting through a massive field guide, using search engines, and other resources.

Merlin is designed to be a birding coach for beginning and intermediate bird watchers. Merlin asks you the same questions that an expert birder would ask to help solve a mystery bird sighting. Notice that date and location are Merlin’s first and most important questions. It takes years of experience in the field to know what species are expected at a given location and date. Merlin shares this this knowledge with you based on more than 200 million sightings submitted to eBird from birders across the United States and Canada.

Merlin also asks you to describe the color, size, and behavior of the bird you saw. Because no two people describe birds exactly the same way, Merlin presents a shortlist of possible species based on descriptions from Cornell Lab experts as well as thousands of bird enthusiasts who helped “teach” Merlin by participating in online activities. They’ve contributed more than 3 million descriptors to help Merlin match your input with the most likely birds. When you identify a species and click “This is My Bird,” Merlin also saves your record to help improve its future performance.

Some people experience birds through the viewfinder of their camera, and putting a name to the bird they just photographed can be both rewarding and educational. The Photo ID feature in Merlin allows anyone with a camera to snap a photo and get a list of suggestions. Photo ID is yet another method to help you identify the birds you encounter.

We launched Merlin in 2014 with the goal of adding more species and more features in time. We appreciate your feedback about what’s working for you, what isn’t, and features you’d like to see. If you’d like to support our efforts to continue developing Merlin, please consider making a donation.

We hope you enjoy using Merlin and sharing it with your friends and family!

Meet the Merlin Team

Bruno Arantes is the Merlin Android developer. He started birding in 2008 in the middle of the Cerrado in Brazil, where he likes to spend most of his free time.

Jessie Barry has a passion for bird identification and sharing it with others. A birder since age 10 and now top bird ID expert in North America, Jessie thinks that leading the Merlin and Macaulay Library teams is just like living a dream.

David Bell is a lifelong birder who has spent his career in businesses devoted to improving the environment. His expertise ranges from birds to physics and machine learning. Dave leads the team at Birds in the Hand, LLC, which partnered with the Cornell Lab to develop the first version of Merlin.

Alex Chang is known as “Tech Norris” by the Web Communications team he leads at the Cornell Lab. There isn’t a technical question, business strategy, mountainous trail, or rock wall Alex won’t tackle.

Miyoko Chu leads the Cornell Lab’s Communications team and is the principal investigator of the NSF-funded Merlin project. She has been amazed to see Merlin go from an idea to reality, thanks to a talented team and thousands of contributors.

Will Morris is an interface and visualization designer at the Cornell Lab. He leads design for eBird, Birds of North America Online, and Neotropical Birds.

Sarah Seroussi created the look-and-feel and led the UX strategy for the Merlin Bird ID app. She also built this website to showcase the app. Sarah has designed several major citizen-science websites for the Cornell Lab.

Dan Serpiello is a software engineer who wishes he had gotten into birds earlier in life. Merlin was his go-to field guide even before working at the Lab and he loves working on a project that brings birds to a mainstream audience.

Drew Weber has been birding since he was a kid, and loves finding new ways to apply new technologies to birding. He is excited to be coordinating the effort to add new features to Merlin and expand the species that the app can identify.

The Merlin team at the Cornell Lab also includes Steve Kelling, Rick Bonney, Tina Phillips, Tim Levatich, Andrew Spencer, Jasdev Imani, Luke Seitz, Gates Dupont, Sam Heinrich, Larry Chen, Kevin Ebert, and Jeremy Collison. Special thanks to John Fitzpatrick, Adriane Callinan, Mary Guthrie, Sean Scanlon, Nicola Leckie, Hugh Powell, France Kehas-Dewaghe, Syed Rehman, Greg Delisle, Ben Barkley, and Marshall Iliff.

Merlin Photographers

Brian Sullivan: In between leading eBird and serving as the photo editor for the Birds of North America Online, Brian manages to snap a few shots on his travels. By a few, we mean thousands! He has 18,000 Red-tailed Hawk images. Can you guess Brian’s favorite bird?

Gerrit Vyn: Few photographers have the artistic eye, patience in the field, and bird expertise to come back from expeditions with stunning images, sounds, and videos every time. Gerrit is a cinematographer and photographer in the Cornell Lab’s Multimedia program.

Christopher Wood: Chris has been carrying a camera on his birding trips since he was in the 5th grade, documenting one rare bird after another. Chris serves as the Assistant Director of Information Science, helping lead eBird, the Birds of North America, and Neotropical Birds.

In addition to Brian, Chris, and Gerrit, we thank the following people for contributing images for the app: Laura Erickson, Kelly Colgan Azar, Steven G. Mlodinow, Penny Bauer, Gerry Dewaghe, Timothy Lenz, Scott A. Haber, Sam Hough, Tony Leukering, David Waltman, Mark Eden, Margo Goetschkes, William Edward Kendall, Thomas B. Johnson, Susan E. Newman, Luke Seitz, Shawn Billerman, Judy Crawford, Jim Cummins, Jason Daly, Tripp Davenport, Jim Dubois, Susan Edmiston, Olivia Graves, Cory Gregory, Dan Haas, Wanda Harnish, Burney Huff, Marshall Iliff, Evan Jackson, Adam S. Johnson, Marty Jones, Larry Jordan, Alex Lamoreaux, Thomas Meinzen, Carol Miller, April Molina, Tom Murray, Carol O’Neil, Laurel Rezeau, Arlene Ripley, Will Stuart, Jeremiah Trimble, Jim Williams, Liam Wolff, Ginnie Yerkovich, Cameron Rognan, Donna Bragg, Herb Helmstaedt, Mairis Kilcher, Michael Henry, Nancy Merrill, Tony and Louisa Katlubeck, Ed Kendall, Terry Johnson, Bill Thompson and over a thousand contributors who uploaded their photos to Macaulay Library.

Recordists and Contributors

Audio recordings: Recordings from more than 100 recordists who have contributed to the Macaulay Library at the Cornell Lab of Ornithology are featured in Merlin. The majority of the recordings in this app were recorded by Geoffrey A. Keller, William W. H. Gunn, Wilbur L. Hershberger, Gerrit Vyn, Michael J. Andersen, Randolph S. Little, and Marco Dragonetti. Members of the xeno-canto, WikiAves, and AVoCet recordist communities contributed additional recordings. You can explore more than 250,000 sounds and videos on the Macaulay Library website.

Audio cuts included in Merlin attempt to cover the full range of vocalizations by each species, and are selected and edited by the collections team at Macaulay Library: Tayler Brooks, Sarah, Dzielski,m Martha Fischer, David McCartt, Jay McGowan, Matt Medler, Andrew Spencer, Brad Walker, and Matt Young.

Identification text: North and South America Jessie Barry, Luke Seitz, and Steven N.G. Howell crafted text for each species specifically for Merlin. Europe: Steven N.G. Howell, Alexander Lees, and Nárgila Moura wrote text for the European species. The text is tailored for those moments when you are watching a bird in the field and using Merlin to pick among species. Thanks to Hugh Powell and Chris Wood for their valuable comments.

Maps: Sourced from the Birds of North America Online. Special thanks to Brooke Keeney for updating and reformatting the maps.

Intro video: Produced by the Cornell Lab’s Multimedia program. We appreciate the creative work of John Bowman, Tom Swartwout, Karen Rodriguez, Eric Liner, and Yula Kapetanakos.

Our Thanks

Merlin is made possible by support from the National Science Foundation (grant number DRL-1010818), Pennington® Wild Bird Food, the Faucett Catalyst Fund, and friends and members of the Cornell Lab of Ornithology. We would like to express our gratitude to them as well as to the photographers who generously donated more than 2,000 images included in the Merlin app. We also give our heartfelt thanks to the dedicated volunteers who made this app possible: eBird participants, visitors to All About Birds, and sound recordists who contributed their audio recordings to the Macaulay Library.