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The animal is inferred to be adult, as indicated by the extensive
development of the secondary osteons, a moderate decrease in spacing between LAGs close to the periphery of the bone, and the presence of the outer circumferential layer comprising of a poorly
vascularized layer of lamellar bone which indicates a slow rate of
bone accretion20. Interestingly, the fourth to seventh sets of LAGs,
which are within the outer circumferential layer, are not tightly
packed as in a typical outer circumferential layer. We thus infer that
the animal reached its young adult size within seven years and was
still at relatively early young adult stage at the time of death and
estimate that a full-sized Gigantoraptor is considerably heaver than
1,400 kg. This suggests that Gigantoraptor has an accelerated growth
rate faster than most other theropods, including large North
American tyrannosaurs such as Albertosaurus and Gorgosaurus8, a
growth strategy seen in most gigantic dinosaurs21,22.
Spowolnienie wzrostu u tyranozaurydów występuje gdy są już bliskie (ok. 90%) rozmiarów maksymalnych.
Erickson, G. M., Makovicky, P. J., Currie, P. J., Norell, M. A., Yerby, S. A., & Brochu, C. A. (2004). Gigantism and comparative life-history parameters of tyrannosaurid dinosaurs. Nature, 430(7001), 772-775.
To uproszczenie, ale nie spodziewałbym się, aby wyrośnięty gigantoraptor był znacznie większy niż znaleziony okaz.