FIGURE 24 Speed versus stride length (top) and stride rate (bottom) for a good human runner, greyhounds, and horses. E, endurance range; S, sprint range; T, trot; G, gallop. Note that humans closely match horses despite being about seven times smaller. (Modified from Bramble, D. M., and Lieberman, D. E. [2004], Endurance running and the evolution of Homo, Nature 432:345–52)
