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Medullary tissue is found only in female birds during ovulation, indicating that "B-rex" was of reproductive age. rex specimens appear to have died within six years of reaching sexual maturity, a pattern which is also seen in other tyrannosaurs and in some large, long-lived birds and mammals today.These species are characterized by high infant mortality rates, followed by relatively low mortality among juveniles.

For example, only 600 kg (1,300 lb) separated the 28-year-old "Sue" from a 22-year-old Canadian specimen (RTMP 81.12.1).But in other respects Tyrannosaurus’ skull was significantly different from those of large non-tyrannosauroid theropods.It was extremely wide at the rear but had a narrow snout, allowing unusually good binocular vision.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short and muscular to support the massive head.The forelimbs were long thought to bear only two digits, but there is an unpublished report of a third, vestigial digit in one specimen.Tyrannosaurus (pronounced /tɨˌrænəˈsɔːrəs/ or /taɪˌrænoʊˈsɔːrəs/, meaning 'tyrant lizard') is a genus of theropod dinosaur.The famous species Tyrannosaurus rex ('rex' meaning 'king' in Latin), commonly abbreviated to T.The tip of the upper jaw was U-shaped (most non-tyrannosauroid carnivores had V-shaped upper jaws), which increased the amount of tissue and bone a tyrannosaur could rip out with one bite, although it also increased the stresses on the front teeth.The premaxillary teeth at the front of the upper jaw were closely packed, D-shaped in cross-section, had reinforcing ridges on the rear surface, were incisiform (their tips were chisel-like blades) and curved backwards.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, including life history and biomechanics.

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