Tyrannosaurus Rex Tooth Hell Creek Fossil T-Rex 1/2 Inch Long Genuine & UnrestoredT Rex Tooth Fragment (partial), Prehistoric Fossil, Genuine, Upper Cretaceous, Worldwide Shipping For sale is a real Tyrannosaurus rex tooth fragment (partial shard). T Rex was among the most powerful carnivores of all time (and is believed to have been an arch rival of Triceratops). It is estimated to have been almost 40 feet long, 15 20 feet tall, and weighed up to 7 tonnes. Its skull alone was almost the size of a full grown human (about 5 feet in