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Science 1 March 2002:
Vol. 295. no. 5560, pp. 1620 - 1621
DOI: 10.1126/science.295.5560.1620
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News of the Week

PALEONTOLOGY:
T. rex Was No Runner, Muscle Study Shows

Erik Stokstad

According to a new biomechanical model, a 6000-kilogram Tyrannosaurus could not have packed enough muscle into its legs to reach 72 kilometers per hour, as had previously been argued; its top running speed was about 40 km/h. Although the finding, published in the 28 February issue of Nature, doesn't change ideas about Tyrannosaurus's hunting ability, paleontologists say the study sets a new standard for biomechanical analysis of an extinct organism.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)