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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.
At this very moment, amphibians are facing an extinction crisis. Over 160 species of amphibians may already be extinct. More than 1,800 amphibian species are threatened with extinction â thatâs 32% of all known amphibian species. The greatest threat facing amphibians is habitat loss and degradation. Pollution, climate change, introduced species, and over-collection are all significant threats.