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. 2017 Jan 11;15(1):e2000473. doi: 10.1371/journal.pbio.2000473

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© 2017 Dick, Clemente

This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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Fig 4 — (A) Top running speeds are reached at different body sizes in (nonfelid) mammals (n = 142), felids (n = 8), and varanids (n = 19). The curvilinear relationship between body mass (kg) and running speed (km h^-1) for mammals (yellow), felids (orange), and varanids (blue). Optimum body mass for speed is denoted by the peak of each curvilinear relationship. Original data reported in [40,46–51]. (B) Frequency distribution for the body masses of extant running mammals [52] (n = 2,919; yellow bars) and extinct dinosaur species [1] (n = 406; red bars) shown with the relationship of optimum mass for speed in nonfelid mammals.