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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 living rodent is the capybara (Hydrochoerus hydrochaeris), native to most of the tropical and temperate parts of South America east of the Andes, always near water. 2  Full-grown capybaras can reach 1.5 m (4.9 ft) long and 0.9 m (3.0 ft) tall at the shoulder and a maximum weight of 105.4 kg (232 lb).