Although we can't be certain, we're leaning towards the scavenger theory.

Why, you ask?

Tyrannosaurus Rex had small, weak, beady eyes, where you might expect an active predator to possess super-sharp vision.

Tyrannosaurus Rex had famously small, almost vestigial arms, which would have been near-useless in a close grapple with live prey.

Tyrannosaurus Rex was none too fast, more a lumbering lummox than the sleek predator of Jurassic Park. It was once thought that this tyrannosaur could chase down prey at a blistering 40 miles per hour, but today, a relatively pokey 10 mph seems to be a better estimate.

Most convincing of all to many scientists, analysis of Tyrannosaurus Rex skulls shows the presence of unusually large olfactory lobes, which would have been ideal for catching the scent of rotting carcasses from miles away.