Synopsis: 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…