Dinosaurs Could Have Been Hot To Trot, Say US Scientists

From The Scotsman:

LARGE two-legged dinosaurs, such as Tyrannosaurus rex, were energetic athletes with warm blood running through their veins, it was claimed today.
New evidence suggests that the ancient reptiles were endothermic – or warm-blooded – like their modern descendants, birds.

Far from being lumbering slow beasts, they were likely to have been agile and active.

But warm blood would have come at a price, because it requires more food. If food became scarce 65 million years ago, this could have been a contributory factor in their extinction.

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