What did Tyrannosaurus rex eat? The obvious answer is “Anything it wanted,” but paleontologists have uncovered some surprises in the actual mealtime habits of the Cretaceous carnivore.

The latest find is a set of 66-million-year-old scrapes on a Tyrannosaurus limb bone found in Wyoming, to be presented at the annual Geological Society of America meeting in Baltimore, Maryland on Monday. These scratches were clearly made by a large predator with serrated teeth, and study leader Matthew McLain says that T. rex itself was the only carnivore around at the time capable of creating such damage.

Not that the dinosaur solely munched on the remains of its own kind. Thanks to a fossil trail of broken bones and fossil feces, paleontologists have quite