|The Black Tortoise is one of the 4 sacred animals that make up the Chinese constellations. It corresponds to wood, the northern direction, and the season of winter. The Black Tortoise is sometimes depicted as a turtle entwined with a snake, sometimes as a turtle with a snake for a tail. Its origins come from the Taoist god Xuan Wu, who is said to have discarded his stomach and intestines in his search for divinity. Those organs became a demonic turtle and snake that terrorized people; Xuan Wu had to return to Earth to subdue them.