The D-shaped cross-section, reinforcing ridges and backwards curve reduced the risk that the teeth would snap when Tyrannosaurus bit and pulled.

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The feeding habits, physiology and potential speed of T. Its taxonomy is also controversial, with some scientists considering Tarbosaurus bataar from Asia to represent 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.

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.

She died later than night surrounded by her friends and family.

Thomas’s more than 4,000 followers on Instagram offered messages of sympathy for his grief.

Thomas said he did not blame doctors for his wife’s death, but urged others who felt unwell to push for a diagnosis if they thought they were not getting the best care.

Tyrannosaurus (pronounced /tɨˌrænəˈsɔːrəs/ or /taɪˌrænoʊˈsɔːrəs/, meaning 'tyrant lizard') is a genus of theropod dinosaur.

Tyrannosaurus rex was one of the largest land carnivores of all time; the largest complete specimen, FMNH PR2081 ("Sue"), measured 12.8 metres (42 ft) long, and was 4.0 metres (13 ft) tall at the hips. rex formed a natural S-shaped curve like that of other theropods, but was short and muscular to support the massive head.

The forelimbs were long thought to bear only two digits, but there is an unpublished report of a third, vestigial digit in one specimen.

The skull bones were massive and the nasals and some other bones were fused, preventing movement between them; but many were pneumatized (contained a "honeycomb" of tiny air spaces) which may have made the bones more flexible as well as lighter.