Smithsonian Institution
Smithsonian National Zoo: Zoogoer Magazine: On Waterdogs, Mudpuppies, and More
Alex Hawes's article, "On Waterdogs, Mudpuppies, and the Occasional Hellbender" looks at the range of creatures within the classification of Amphibian. He does not spend time discussing frogs or toads in depth, but focuses on the rest of...
San Diego Zoo Global
San Diego Zoo: Amphibians
This resource offers extensive information about amphibians. Visitors can click on the listed amphibians for further information.