A survey of snakes, lizards, turtles and crocodilians includes observations and findings from living herpetologists and offers much in the natural history of reptiles. Function, classification, anatomy; food, feeding, reproduction, physical age and size; relations to man, economic importance; when introduced to science, where found; enemies and defenses; similarities and differences -- this is the handling of the material on all the varieties within the groups and families, to which is added guidance on the care and keeping of some of them as pets -- turtles, lizards, snakes. There will be more than 200 photographs which will increase its value as an identification and recognition guide. A worthwhile library Addition and of importance in nature study classes and groups. There is a bibliography after each section.