ID Toolkit
December 2009
David Allen Sibley
Artist David Allen Sibley is the author of the bestselling Sibley Guide to Birds, Sibley's Birding Basics, and Sibley guides to birds of eastern and western North America. His first article for Birder's World (now BirdWatching), a profile of St. Marks National Wildlife Refuge in Florida, appeared in our August 2006 issue. His column "ID Toolkit" appears in every issue of the magazine.

Read more about David Allen Sibley
Five fundamental feather groups determine the head pattern of nearly every songbird
By David Allen Sibley
Published: October 23, 2009
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