"AmphibiaWeb offers ready access to taxonomic information for every recognized species of amphibians in the world."  You will find species descriptions and life history information.

Animal Diversity

Animal Diversity is an "online database of animal natural history, distribution, classification and conservation biology."  The site includes text, pictures of living animals, photographs, movies of specimens, and/or recordings of animal sounds.

Classification of Living Things

Classification of Living Things is an online tutorial for learning the principles of taxonomy with a focus on human classification categories.   This site does a great job in explaining classification in a simple clear and concise manner.

Embl Reptile Database

"This database is intended to provide information on the classification of all living reptiles by listing all species and their pertinent higher taxa.  It is supposed to be a source of taxonomic data, providing primarily (scientific) names, synonyms, distributions, and related data."

World Biodiversity Database

“The World Biodiversity Database contains taxonomic information (hierarchies), species names, synonyms, descriptions, illustrations and literature references when available.