W. Scott Persons looks at the skeleton of the Tyrannosaurus rex "Scotty" at the T. rex Discovery Center in the Canadian East End. (Photo: Amanda Kelley / University of Alberta, AFP / Getty Images)

Paleontologists have discovered the largest ever discovered fossil of Tyrannosaurus rex, researchers say.

Nicknamed "Scotty", the mighty predator was about 42 years old and probably weighed more than 9.7 tonnes, according to a study published last week in the peer-reviewed journal The Anatomical Record , The giant specimen is not only the largest T. rex ever found, it is also larger than any other carnivorous dinosaur.

"This is the cornerstone of rexes," study author W. Scott Persons said in a press release. "The Tyrannosaurus has considerable size variability. Some people were more boring than others and others were more robust. Scotty is an example of robustness.

The fossil was named after a festive bottle of scotch that opened the night it was discovered in Canada. Although the bones were found in 1991, it took more than a decade to dig them out of the surrounding hard sandstone.

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in which Scotty died in Saskatchewan about 66 million years ago, the study said. Most T. rexes grew quickly and died early, making Scotty the oldest of its kind.

"One can get a picture of how old a dinosaur is by cutting its bones and examining its growth patterns. Scotty is all old growth, "Persons said. "According to Tyrannosaurus standards, it had an unusually long life. And it was violent. "

Scotty's bones carry the scars of numerous injuries, including a broken rib, an infected jaw, and a bite that appears to come from another T. rex on his tail.

The skeleton is about 65 percent completed and is scheduled for display in the Royal Saskatchewan Museum in May.

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