When the wilderness calls--or even just the back yard--young nature lovers need a helpful guide to set them on the right track. Now kids can learn about their favorite animals--from cheetahs to snakes--in a whole new way: from the signs they leave behind. What does a row of tracks signify? What can we tell from an accumulation of twigs left behind in the crook of a tree? What are those squiggly marks in the sand? Animal Tracks and Signs gives young...