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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.
The hippopotamus is the most massive of the even-toed ungulates. 1  The largest species in terms of weight is the hippopotamus (Hippopotamus amphibius), native to the rivers of sub-Saharan Africa. 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.