The principal threats to big cats are habitat destruction and poaching. In the United States, 19 states have banned ownership of big cats and other dangerous exotic animals as pets, and the Captive Wildlife Safety Act bans the interstate sale and transportation of these animals. Nevertheless, there are still an estimated 15,000 big cats kept captive in the United States, and only a small percentage of them are in accredited zoos. The remainders are in private homes and nonaccredited roadside zoos.