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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.
Image caption The tiny frog sits easily on a US dime, whose diameter is 18mm. A frog species that appears to be the world's smallest has been discovered in Papua New Guinea by a US-based team. At 7mm (0.27 inches) long, Paedophryne amauensis may be the world's smallest vertebrate-the group that includes mammals, fish, birds and amphibians. The researchers also found a slightly larger relative, Paedophryne swiftorum.