Fig. 7. Frequency distributions of strain magnitudes for the cranial, caudal and medial surfaces of the metacarpus, for both outdoor and treadmill locomotion. Peak principal strain magnitudes (absolute magnitudes of compressive or tensile principal strains) are shown for cranial and caudal surfaces (A–D) and peak axial strain magnitudes are shown for medial surfaces (E,F). These distributions contain pooled data across all behaviors and individuals, providing an estimate of the distribution pattern for the population of strains recorded at each bone surface. During both outdoor and treadmill locomotion, strains in all three surfaces appeared to be log-normally distributed, although only in the cases where P>0.05 (caudal outdoor, C, and medial treadmill, F) was the fit not significantly different from a standard lognormal distribution. The pooled sample size and the median are shown, as well as the D-statistic from the KSL goodness-of-fit test, which indicates that the outdoor data had smaller deviations from the best-fit lognormal curves than the treadmill data.