Beipiaosaurus

Beipiaosaurus ("Beipiao lizard") is one of the the therizinosaurs, a very strange group of Theropods. Therizinosaurs (also known as "sloth dinosaurs") have very short, heavy feet, wide bellies, long necks, big claws, and small heads at the end of long necks. Their teeth are leaf-shaped, like those of the plant-eating dinosaurs, which makes them plant-eating members of the family of meat-eating dinosaurs!

More real-life information: Beipiaosaurus at Wikipedia.