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The largest living amphibian is the 1.8 m (5 ft 11 in) Chinese giant salamander (Andrias davidianus), but this is dwarfed by the extinct 9 m (30 ft) Prionosuchus from the middle Permian of Brazil. The study of amphibians is called batrachology, while the study of both reptiles and amphibians is called herpetology.
Amphibians, such as frogs, toads, salamanders,  newts, and gymnophiona, are cold-blooded animals that metamorphose  from a juvenile, water-breathing form to an adult, air-breathing  form.nlike other land  animals (amniotes), amphibians lay eggs in water, as their fish  ancestors did. Amphibians are superficially similar to  reptiles.    Amphibians are cold-blooded animals, meaning they do not have a  constant body temperature but instead take on the temperature of  their environment.