DAVID ALLEN SIBLEY is the author and illustrator of the series of successful guides to nature that bear his name, including The Sibley Guide to Birds. He has contributed to Smithsonian, Science, The Wilson Journal of Ornithology, Birding, BirdWatching, North American Birds, and The New York Times. He is a recipient of the Roger Tory Peterson Award for Promoting the Cause of Birding from the American Birding Association and the Linnaean Society of New York's Eisenmann Medal. He lives and birds in Massachusetts.