Cryptozoology (from Greek κρυπτός, kryptos, "hidden" + zoology; literally, "study of hidden animals") is a pseudoscience involving the search for animals whose existence has not been proven. This includes looking for living examples of animals that are considered extinct, such as dinosaurs; animals whose existence lacks physical evidence but which appear in myths, legends, or are reported, such as Bigfoot and Chupacabra; and wild animals dramatically outside their normal geographic ranges, such as phantom cats (also known as Alien Big Cats).
The animals cryptozoologists study are often referred to as cryptids, a term coined by John Wall in 1983.
There are thousands of cryptids and more are being filed every year. Some of the creatures that are cryptids have only been seen once or twice, however, there are lots that have been seen many of times. These sightings still occur in todays world and most likely will continue throughtout many generations. The one of the most popular Cryptids is Bigfoot.