Like other tyrannosaurids, Tyrannosaurus was a bipedal carnivore with a massive skull balanced by a long, heavy tail. Relative to its large and powerful hindlimbs, Tyrannosaurus forelimbs were small but were unusually powerful for their size and bore two clawed digits. Although other theropods rivaled or exceeded Tyrannosaurus rex in size, it was the largest known tyrannosaurid and one of the largest known land predators; the most complete specimen measures up to 12.3 m (40 ft) in length, up to 4 metres (13 ft) tall at the hips, and up to 6.8 metric tons (7.5 short tons) in weight. By far the largest carnivore in its environment, Tyrannosaurus rex may have been an apex predator, preying upon hadrosaurs, ceratopsians, and possibly sauropods, although some experts have suggested it was primarily a scavenger. The debate about whether Tyrannosaurus was an apex predator or scavenger was among the longest running in paleontology; however, most scientists now agree that Tyrannosaurus rex was an opportunistic carnivore, both predating and scavenging.
More than 30 specimens of Tyrannosaurus rex have been identified, some of which are nearly complete skeletons. Soft tissue and proteins have been reported in at least one of these specimens. The abundance of fossil material has allowed significant research into many aspects of its biology; e.g., life history and biomechanics. The feeding habits, physiology and potential speed of Tyrannosaurus rex are a few subjects of debate. Its taxonomy is also controversial: some scientists consider Tarbosaurus bataar from Asia to be a second species of Tyrannosaurus and others maintaining Tarbosaurus as a separate genus. Several other genera of North American tyrannosaurids have also been synonymized with Tyrannosaurus.
In the Max Steel (2013 TV Series), there was an exhibit in the Copper Canyon History Museum and there was a Tyrannosaurus Rex Exhibit and also an Amber Stone with a mosquito, which sixteen millions years ago, sucked the blood of a Tyrannosaurus Rex and the blood contained the DNA of the beast. Then Extroyer stole it so that he could Extroy into Extroyer Tyrannosaurus Rex in the episode, Thanks, I Think.