Tyrannosaurus en pointe: Allometry minimized rotational inertia of large carnivorous dinosaurs

Donald M. Henderson, Eric Snively

Research output: Contribution to journalArticle

33 Scopus citations

Abstract

Theropod dinosaurs attained the largest body sizes among terrestrial predators, and were also unique in being exclusively bipedal. With only two limbs for propulsion and balance, theropods would have been greatly constrained in their locomotor performance at large body size. Using three-dimensional restorations of the axial bodies and limbs of 12 theropod dinosaurs, and determining their rotational inertias (RIs) about a vertical axis, we show that these animals expressed a pattern of phyletic size increase that minimized the increase in RI associated with increases in body size. By contrast, the RI of six quadrupedal, carnivorous archosaurs exhibited changes in body proportions that were closer to those predicted by isometry. Correlations of low RI with high agility in lizards suggest that large theropods, with low relative RI, could engage in activities requiring higher agility than would be possible with isometric scaling.

Original languageEnglish
Pages (from-to)S57-S60
JournalProceedings of the Royal Society B: Biological Sciences
Volume271
Issue numberSUPPL. 3
DOIs
StatePublished - 7 Feb 2004
Externally publishedYes

Keywords

  • Archosaurs
  • Biomechanics
  • Rotational inertia
  • Theropods
  • Turning performance

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