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There are about 5,500 known species of amphibians, divided into 3 main groups: salamanders, newts, and mudpuppies; caecilians; and frogs and toads. The largest amphibian is the Japanese giant salamander Andrias japonicus, at 6 feet long (1.8 meters) and 140 pounds (63 kilograms), and the smallest is an Izecksohn’s toad Brachycephalus didactylus that weighs just a few grams.
