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1.B. K. Ahlborn, Zoological Physics (Springer-Verlag, Berlin, 2006); J. T. Bonner, Why Size Matters: From Bacteria to Blue Whales (Princeton University Press, Princeton, NJ, 2006); A. Shingleton, “Allometry: The study of biological scaling,” Nat. Educ. Knowl. 3 (10) 2, (2010).
2.Purchased from Gaston Design, Inc. ( Other possible sources of bone models include Bone Clones, Inc. ( An Internet search will reveal other sources of model bones.
3.P. Christiansen, “Long bone scaling and limb posture in non-avian theropods: Evidence for differential allometry,” J. Vertebr. Paleontol. 19, 666680 (1999).
4.P. Larson, “Variation and sexual dimorphism in Tyrannosaurus rex,” in Tyrannosaurus rex: The Tyrant King, edited by Peter Larson and Kenneth Carpenter (Indiana University Press, 2008), pp. 103128.
5.P. Christiansen and G. S. Paul, “Limb bone scaling, limb proportions, and bone strength in neoceratopsian dinosaurs,” Gaia 16, 1329 (2001).
6.A. A. Biewener, “Biomechanical consequences of scaling,” J. Exp. Biol. 208, 16651676 (2005).

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Finding topics that inspire students is an important aspect of any physics course. Virtually everyone is fascinated by , and the excitement of the class is palpable when we explore scaling effects in and other bipedal theropod dinosaurs as part of our discussion of mechanics and elasticity. In this paper, we explore the role of longitudinal stress in the femur bones due to the weight of the dinosaur in determining how the geometry of the femur changes with size of the theropod. This is one area of allometry the study of how different biological characteristics scale with size. 1


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