Discovered in 1991, the Tyrannosaurus rex specimen known as Scotty weighed an estimated 19,500 pounds in life—making it the biggest T. rex ever found.
While the giant carnivore's skeleton was discovered in 1991, paleontologists spent more than a decade just removing the hard sandstone that covered its bones. Only now have they been able to study it and realize its uniqueness, which is not limited to its size.
