Animal Tracks, An Introduction to Tracks and Signs of Familiar North American Species, is a must-have reference guide for beginners and experts alike. This guide allows you to quickly identify the tracks and signs of common mammals and birds. The folded format allows for easy comparison of similar tracks, and a ruler is included on the back panel for easy measuring.The Pocket Naturalist(tm) series is an introduction to common plants and animals and natural phenomena. Each pocket-sized, folding guide highlights up to 150 species and most feature a map identifying prominent sanctuaries and outstanding natural attractions. Each is laminated for durability. (31/2 X 81/4 folded, opens to 22 X 81/4, illustrations)