For common people, the T.Rex, scientifically called Tyrannosaurus rex (photo of the skeleton ©ScottRobertAnselmo), is the most ferocious predator in world’s history. Instead, among paleontologists for almost a century there’s been a dispute about whether it was a predator or a scavenger. Recently, a group of researchers has found in South Dakota the remains of a hadrosaur with the tooth of a T.Rex wedged between the vertebrae of its tail. This discovery is considered a proof that this animal was indeed a predator.