An exotic pet is a rare or unusual animal pet, or an animal kept within human households which is not commonly thought of as a pet. The definition is an evolving one; some rodents, reptiles, and amphibians have become firmly enough established in the world of animal fancy to no longer be considered exotic. Sometimes any unique or wild-looking pet (including common domestic animals such as the ferret and the domestic rat) is called an exotic pet. "Exotic" may also be used for a species which is non-indigenous to the owner's locale. Many major pet stores and service providers (such as veterinary insurance carriers or online retailers) tend to classify any animal besides cats, dogs, small rodents, small birds or fish as "exotic".It has been estimated that as many as 15,000 non-human primates are kept by private individuals as pets in the United States. Nine states ban the keeping of non-human primates, but no federal law regulates ownership. In 1975, the Center for Disease Control prohibited their import into the US for use as pets. The breeding industry uses descendants of animals imported before 1975. Non-human primates of various species, including those listed as endangered, such as cottontop tamarins, baboons, chimpanzees, Diana monkeys, slow lorises, lemurs and gibbons are still available for purchase in the US.