Fig. S1. Proportional underestimation (ratio of apparent to true distance travelled), plotted against sampling frequency for 10 terrestrial mammal species on Barro Colorado Island, Panama, with varying degrees of autocorrelation in speed of movement (correlation coefficient denoted r, colour coded as indicated). The parameters d, ? and ? in eqn 11 were estimated by fitting curves to data generated from simulations of the species-specific random walk models.

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