Michael S. Finkler, Dennis L. Claussen, Influence of Temperature, Body Size, and Inter-Individual Variation on Forced and Voluntary Swimming and Crawling Speeds in Nerodia sipedon and Regina septemvittata, Journal of Herpetology, Vol. 33, No. 1 (Mar., 1999), pp. 62-71
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Finkler et al. (1999) studied this question.
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