What are creatures that are not proven that they exist?

Creatures that are not proven to exist often fall into the realm of cryptozoology, which studies animals whose existence is based on anecdotal evidence or folklore rather than scientific proof. Examples include the Loch Ness Monster, Bigfoot, and the Chupacabra. While many people claim to have seen these creatures, there is a lack of conclusive scientific evidence to validate their existence. Such creatures often capture the imagination and intrigue of people, leading to ongoing searches and investigations.