The meaty hind legs of larger frogs are considered a delicacy in many countries. In the United States, people mainly eat the legs of bullfrogs, green frogs, and leopard frogs. Frogs also are used widely in the laboratory. Medical researchers use frogs to test new drugs, and students dissect frogs to learn about anatomy. Human beings are, in fact, the frog's worst enemy.
People obtain most of the frogs used for food and in the laboratory from the wild.
Furthermore, people destroy the homes and breeding places of frogs by replacing natural areas with cities and farms. They also pollute and so poison the waters in which frogs dwell. True frogs make up the family Ranidae. All North American true frogs are in the genus Rana. Tree frogs make up the family Hylidae.