the Oonaya is a monster from the episode Hunted.
The Oonaya is a werewolf like creature that lives in the jungles of South America. It's job is to protect animals from hunters who would seek to harm them. An Oonaya is actually a hunter him/herself, who was changed into the beast via an ancient curse. The curse cannot be removed, only transferred, specifically to another hunter, who is heartless and cruel enough to deserve it, and the previous host changes back to normal, having learned kindness and humility as the beast.
The Oonaya has the body of a gorilla, and a crocodile like face.