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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.
To identify an animal as an amphibian, it should have each of these characteristics: 1  Amphibians have a backbone. 2  They are vertebrates. 3  Amphibians are cold-blooded. 4  They cannot regulate their own body temperature.