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Large fenestrae (openings) in the skull reduced weight and provided areas for muscle attachment, as in all carnivorous theropods.
But in other respects Tyrannosaurus’ skull was significantly different from those of large non-tyrannosauroid theropods.
The forelimbs were long thought to bear only two digits, but there is an unpublished report of a third, vestigial digit in one specimen.
In contrast the hind limbs were among the longest in proportion to body size of any theropod.
rex from Montana (MOR 1125, also known as "B-rex").
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.
However, this rarity may also be due to the incompleteness of the fossil record or to the bias of fossil collectors towards larger, more spectacular specimens.
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.
rex may have been an apex predator, preying upon hadrosaurs and ceratopsians, although some experts have suggested it was primarily a scavenger. rex have been identified, some of which are nearly complete skeletons.