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Sketches by David Sibley reveal similarity and variation in bill shape

When we talk about identification, we tend to focus on differences, but it can be instructive (and reassuring) to think about similarities. In fact, understanding differences often requires us to appreciate the similarities between species. Bill shapes vary widely, and nearly every species can be identified by its bill alone. The shapes are closely related … Read More "Sketches by David Sibley reveal similarity and variation in bill shape"
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David Sibley

David Sibley

David Sibley writes the column “ID Toolkit” in every issue of BirdWatching. He published the Sibley Guide to Birds in 2000, the Sibley Guide to Bird Life and Behavior in 2001, and Sibley’s Birding Basics in 2002. He is also the author of the Sibley Guide to Trees (2009), the Sibley Guide to Birds-Second Edition (2014), guides to birds of eastern and western North America (2016), and What It’s Like to Be a Bird (2020). He is the recipient of the American Birding Association’s Roger Tory Peterson Award for lifetime achievement in promoting the cause of birding and a recognition award from the National Wildlife Refuge System for his support of bird conservation.

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