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Mocomi & Anibrain Digital Technologies
Mocomi: What Are Amphibians?
Learn how amphibians are classified, why they have thin and moist skin, and other interesting facts.
Other
University of Aberdeen: The Phyla of Kingdom Animalia
Very systematic breakdown of the animal kingdom starting with the simplest type the sponge, all the way to the chordate or vertebrate. Each phylum has a link with information.