Cryptozoology is a pseudoscience involving the search for creatures whose existence has not been proven due to lack of evidence. The animals cryptozoologists study are referred to as cryptids by cryptozoologists. This includes living examples of creatures that are otherwise considered extinct, such as non-avian dinosaurs; animals whose existence lacks physical evidence but which appear in folklore, such as Bigfoot and chupacabras; and wild animals dramatically outside their normal geographic ranges, such as phantom cats.