• Amphibians - Lissamphibia - The Animal Encyclopedia

      animals.about.com/od/amphibians/p/amphibians.htm Amphibians are the most ancient of all tetrapod lineages and the first to have climbed onto dry land some 370 million years ago.
    • Amphibians.org

      www.amphibians.org Undertakes practical programs to conserve amphibians and their habitats around the world. Includes details of projects, publications, news, funding and the worldwide ...
    • Amphibian Ark: What Are Amphibians?

      www.amphibianark.org/education/what-are-amphibians All about amphibian biology, taxonomy, ecology: frogs, toads, caecilians and salamanders. Learn about the decline of amphibians and their role in nature.
    • Amphibian - New World Encyclopedia

      www.newworldencyclopedia.org/entry/Amphibian Amphibians (class Amphibia) are cold-blooded tetrapods (four-legged vertebrates) whose eggs lack a tough protective membrane around the embryo. The term "amphibian ...