Peterson FlashGuides are the most compact and convenient field guides ever made. Unfolding in a flash, they show at a glance all the most common wildlife and plant life of a particular type or a particular region, and they employ the famous Peterson Identification System to pinpoint the key differences between species. Animal Tracks is based on Olaus Murie's classic A FIELD GUIDE TO ANIMAL TRACKS, one of the most popular titles in the Peterson series. It shows how to identify the tracks and other signs of more than 100 mammals, birds, insects, reptiles, and amphibians of North America.