An obscure, undocumented creature typically originating from folklore . Typically mythological in nature, but not necessarily supernatural , their existence is only recognized as pseudoscience .
Animals which are commonly not believed to exist, but actually may. Instances include the Loch Ness Monster, Bigfoot, the Teratornis, and Pterodactyl, Mothmen, etc.
The very tiny zone of species close enough to humans, where it's legal to have sex with them, yet far enough from humans where it's legal to kill them.
"Your turn, Frank. When you find Bigfoot, will you fuck him or kill him?"
"Well both options are legal, aren't they, because Bigfoot is in the Cryptid Goldilocks Zone."