Tyrannosaurus
Although other theropods rivalled or exceeded Tyrannosaurus rex in size, it was the largest known tyrannosaurid and one of the largest known land predators. It was up to  in length, up to  tall at the head  and up to  in weight.  By far the largest carnivore in its environment, Tyrannosaurus rex probably preyed on hadrosaurs and ceratopsians, or may have been a scavenger. The debate over Tyrannosaurus as apex predator or scavenger or both is among the longest running in paleontology.