Largest (and oldest) T-Rex fossil uncovered:
Paleontologists have discovered the biggest Tyrannosaurus rex fossil yet found, according to a new study. The fossil is also the largest dinosaur ever uncovered in Canada. About 66 million years ago, the fossil -- nicknamed "Scotty" -- belonged to a 42-foot-long Tyrannosaurus roaming prehistoric Saskatchewan. When researchers studied the leg bones, they found that the dinosaur probably weighed in at about 9.7 tons. That makes this Tyrannosaurus bigger than any other carnivorous dinosaur.
"This is the rex of rexes," Scott Persons, lead author of the study and a postdoctoral researcher in the University of Alberta's Department of Biological Sciences, said in a statement. "There is considerable size variability among Tyrannosaurus. Some individuals were lankier than others and some were more robust. Scotty exemplifies the robust. Take careful measurements of its legs, hips, and even shoulder, and Scotty comes out a bit heftier than other T. rex specimens."
Scotty has quite a history, and he wasn't dug out of the ground recently. Rather, the fossil was discovered in 1991, but his bones were locked in hard sandstone. It took more than a decade to remove the stone, fully assemble the fossil and study Scotty to realize how different he was from other T. rex fossils. The nickname comes from the celebratory scotch that was imbibed on the night the fossil was discovered. "Scotty is the oldest T. rex known," Persons said. "By which I mean, it would have had the most candles on its last birthday cake. You can get an idea of how old a dinosaur is by cutting into its bones and studying its growth patterns. Scotty is all old growth."
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