Snakes, lizards, turtles, and crocodilians all belong to the class of animals known as reptiles. Of the 275 or so species found in North America, there are about 110 kinds of snakes, 110 kinds of lizards, nearly 50 turtles, and just 3 crocodilians.
Reptiles are cold-
Information accompanying the images of the species shown in the following links was taken from the following books:
A Field Guide to Snakes by Alan Tennant
Handbook of Reptiles and Amphibians (Parts 1 & 2) by Ray E. Ashton, Jr. and Patricia Sawyer Ashton
Florida's Fabulous Reptiles & Amphibians by Pete Carmichael and Winston Williams