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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.
Typically, amphibians have four limbs. Unlike  other land animals amenities amphibians lay eggs in water, as their  fish ancestors did. Amphibians are superficially similar to  reptiles. It is a coldblooded vertebrate (it has a backbone) e.g.  frog, toad, newt..