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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.
Tiger salamanders are 4-legged, tailed amphibians. Adult salamanders are often mistaken for lizards. Unlike reptiles, amphibians have moist, scaleless skin, bulging eyes, and no claws on their feet. Adult tiger salamanders have a broad head, a long sticky tongue, and a mouth shaped almost like a smile. Their four legs extend from the sides of their bodies, giving them a peculiar gait. The adult normal body length for a tiger salamander is 6 to 8 inches (15 - 20 cm) with a record length of 13 inches (33 cm). They are easily recognized by their olive or yellow bars, blotches, or spots along their black or brownish body.