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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.
1 The largest species in terms of weight is the hippopotamus (Hippopotamus amphibius), native to the rivers of sub-Saharan Africa. 2  They can attain a size of 4,500 kg (9,900 lb), 4.8 m (16 ft) long and 1.66 m (5.4 ft) tall.