The Tyrannosaurus rex, and other members of the tyrannosaurus family, are not the only carnivorous dinosaur to have tiny arms, according to a study recently published in Current Biology. Researchers from Ernesto Bachmann Paleontological Museum in Neuquén, Argentina, discovered fossilized remains of the Meraxes gigas, a large carnivore — like the T. rex — that also had disproportionate arms. These findings indicated that the T. rex and M. gigas evolved independent of each other and the use of these shorter arms.