What makes a frog an amphibian but a snake a reptile? Both classes may lay eggs, but they have different skin coverings and breathe in different ways. Pages of

Hop, hop! Is that a frog or a toad jumping down on the ground? Many people have trouble telling these lookalikes apart! In this title, simple text and bright ph

Written by outstanding authorities in the field, this Northwest guide tells in interesting and readable fashion how to find and identify the various salamanders

Provides a guide to reptiles and amphibians found in North America, including information on the animal's size, habitat, and behavior, identification tips, and

"All mammals share certain characteristics that set them apart from animal classes. But some mammals live on land and other mammals spend their lives in water--