Running a-Fowl of the Law

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Science  02 Jan 2004:
Vol. 303, Issue 5654, pp. 47-48
DOI: 10.1126/science.1093588

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Physiologists have long pondered about the amount of energy required to swing the legs during running. As Heglund explains in his Perspective, a lot of energy seems to be required for leg swinging. New work in guinea fowl shows that as the birds run, they consume a significant fraction of the total energy during the leg-swinging phase of locomotion ( Marsh et al.).