Fig. 5.

Bipedal, and more unpredictable, locomotion is associated with lower open-field anxiety in sympatric desert rodents. a Percentage of observed time spent in open field by species, as a function of the entropy of each species’ trajectories during simulated predation trials in the natural habitat enclosures. The quadrupedal jird, Meriones sp., is shown in blue, the bipedal jerboa, Dipus sagitta, is shown in green, and the bipedal jerboa, Allactaga elater, is shown in orange. Error bars indicate 95% confidence intervals for each species (n (Allactaga elater) = 14 videos, n (Dipus sagitta) = 6 videos, n (Meriones sp.) = 5 videos). b Percentage of time spent in open field is significantly different between species in laboratory Light-Dark Box trials (Welch Two Sample t-test: P = 0.005, t = −3.4113, df = 11.756, 12 J. jaculus trials, 18 M. unguiculatus trials). The boxes span the interquartile range, the bold line represents the median, the whiskers extend to 1.5 times the interquartile range