The Petudysaurus is a wild north-african cave-dweller, seen only on weekends and late-nights. He sleeps about 16 hours a day, and contents himself by eating large heaps of sand. He is believed to be one of the greatest players of tic-tac-toe the world has yet seen. If you happen to spot a Petudysaurus, hand him a bunch of croutons and he might become your friend. might. 
