Perhaps you meant to ask what are cryptids?
If that's the case, cryptids are something considered mythical, their existence not accepted by science, but still believed in by many. Data on cryptids is not usually accompanied by hard evidence, though there have been many hoaxes throughout history.
Bigfoot is one example of a cryptid; the Bunyip, the Loch Ness Monster, the Yeti, and the Yowie are others. Others cryptids include various creatures named the 'Beast of [insert name of claimed habitat here]' which are frequently described as big cats such as panthers, lions, and so on. There are theories that big cats escaped from private zoos and interbred with local large animals, producing a line of 'Beasts of ...'
Cryptozoology is the study of cryptid animals; cryptobotany is the study of cryptid plants, and legends abound of man-eating, or domestic-animal-eating, versions of such plants as the venus flytrap, or even just plain large trees turned killer.
There will always be researchers on the lookout for these plants and animals, from the marshlands of Britain to the rainforests of South America.
To get the truck from under the bridge you have to lower the left tire and the man will give you a camera.
you go to puto rico and go to the star north of themain farm and got to the right climb the wooden pillars to the top of the rock and that's where they are