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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.
Costa Rican amphibians range in size from the rainforest rocket frog, at 1.5 cm (0.5 in), to the giant toad, at up to 15 cm (6 in) and 2 kg (4.4 lb). Representatives of all three orders of amphibians - caecilians, salamanders, and frogs and toads - reside in Costa Rica.