The Maltos IV natives were a species native to the planet Maltos IV, living in at least one area called the valley of the green river. They had more than two eyes and an antler on their heads. They also did not appear to have any qualms over eating sentients, as they were able to eat Klingons. Their Gods were called the Great Ones, which they gave sacrifices to, and their society was lead by the Wise Ones. The event was told in the Book of Fulfillment, which was a fragment of scroll that was discovered on Maltos IV by Richard Galen. (TOS short story: "Book of Fulfillment")