From leading ornithologist David Sibley, this flashcard deck is designed for the beginner and backyard bird watcher.     The Sibley Field Guide to Birds is now transformed into 100 easy-to-reference cards housed in one handsome pull-drawer gift box. Divided into one stack of 50 common Western and Eastern North American birds, and one stack of 50 common birds found across North America, each card features precise illustrations and text concerning habitat, behavior, and voice description necessary for easy identification. Edited with the backyard birder in mind, each bird card is accompanied with a regional map as an additional guide to migratory patterns.