This settles the question of whether T-rex was a predator, but not whether it was also a scavenger. Some paleontologists, including Jack Horner, pushed the idea that they were only scavengers, and there is some evidence suggesting they did eat carrion. One of the best is T-rex's huge nasal cavity, that would have allowed it to detect rotting meat over a large area.
If the Cretaceous was anything like today, the vast majority of the predators would have also been scavengers, and there has never been much reason to think otherwise.
--- In geology2@yahoogroups.com, Lin Kerns <linkerns@...> wrote:
>
> <http://images.sciencedaily.com/2013/07/130716135841-large.jpg>
> *Researchers recently discovered the crown of a T. rex tooth lodged in the
> fossilized spine of a plant-eating hadrosaur that seems to have survived
> the attack. (Credit: Illustration by University of Kansas alumnus Robert
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