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To compensate for the immense bulk of the animal, many bones throughout the skeleton were hollow, reducing its weight without significant loss of strength.Large fenestrae (openings) in the skull reduced weight and provided areas for muscle attachment, as in all carnivorous theropods.rex was feathered, at least during some stage of its life, as we do that australopithecines like Lucy had hair." The first evidence for feathers in tyrannosauroids came from the small species Dilong paradoxus, found in the Yixian Formation of China, and reported in 2004.As with many other theropods discovered in the Yixian, the fossil skeleton was preserved with a coat of filamentous structures which are commonly recognized as the precursors of feathers.
Tyrannosaurus lived throughout what is now western North America, on what was then an island continent known as Laramidia.
and among the last non-avian dinosaurs to exist before the Cretaceous–Paleogene extinction.
Like other tyrannosaurids, Tyrannosaurus was a bipedal carnivore with a massive skull balanced by a long, heavy tail.
Its taxonomy is also controversial, as some scientists consider Tarbosaurus bataar from Asia to be a second Tyrannosaurus species while others maintain Tarbosaurus is a separate genus.
Several other genera of North American tyrannosaurids have also been synonymized with Tyrannosaurus.
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Tyrannosaurus had a much wider range than other tyrannosaurids.