New research indicate T-rex was a cannibal.
ABC News reported:
What did Tyrannosaurus rex eat? To some extent, say researchers, they ate each other.
The less-than-appetizing news, that T. rex may have been a cannibal, comes from Nicholas Longrich, a paleontologist doing his post-doctoral work at Yale University. He reports that he was sorting through 65-million-year-old fossils from Montana when he found the toe bone of a Tyrannosaurus rex with a gouge mark in it -- a small but clear sign that something else had been feeding on it.