Eh...T-rex was a scavenger anyway.
"....scientists think that T-Rex didn't chase down its prey at all, but was merely a scavenger. As a scavenger he fed off of already dead animals, killed by old age, disease, or other carnivores,
Paleontologist Jack Horner of the Museum of the Rockies is leading proponent of the theory that T. rex could not have been a predator. He maintains that its eyes were too small to see distant prey; its arms were too small to hold victims; and that is huge legs would have resulted in it moving slowly. He also points out that its large olfactory lobes provided it with an acute sense of smell. Vultures also have large olfactory lobes which they use to smell dead bodies at great distance...."