Britannica Educational Publishing 
Reptiles and Amphibians [PDF ebook] 

More than 15, 000 species of reptiles and amphibians roam planet Earth today. Believed to be descendents of the dinosaurs, reptiles are scaly and cold-blooded. Amphibians lead something of a double-life, since they are capable of living in terrestrial and aquatic habitats. This colorful volume details the physical characteristics, as well as the breeding and feeding behaviors, of both reptiles and amphibians, with an up-close look at many of these remarkable creatures.