Tyrannosaurus rex Could Have Weighed 9 Tons, Grew Fast

Johnny Cash might have said life wasn't easy for a dinosaur named Sue. She grew up quick and she grew up mean, packing on nearly 4,000 pounds a year as a teenager. "We estimate they [Tyrannosaurs] grew as fast as 3,950 pounds per year (1790 kg) during the teenage period of growth, which is more than twice the previous estimate," said John R. Hutchinson of The Royal Veterinary College, London in a press release. Modeling the teenage growth spurts of an ancient mega-predator was made possible by...Full Story
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