The most comprehensive field guide available to North American butterflies-a must-have for any enthusiast's day pack or home library-from the go-to reference source for over 18 million nature lovers.The National Audubon Society Field Guide to Butterflies is an easy-to-use, essential guide to all true butterflies, the most common skippers, and many migrants and strays. It features a durable vinyl biding, color plates visually arranged by shape and color, and thumb-tab silhouettes for quick and easy identification of butterflies in the field. The species account for each butterfly provides measurements, descriptions of each stage of the life cycle, and information on coloring or distinguishing markings, flight period, habitat, and range.