Fig. 3. Range of head (triangles) and trunk (circles) excursions in the pitch plane during walks and gallops (N=10 cycles/gait/species). For both (A) hanumans and (B) bonnets, the clusters of symbols to the left (lower velocities) are for walks, whereas the clusters to the right (higher velocities) are for gallops. Note that the head usually pitches through more degrees than the trunk during walks. By contrast, the trunk usually pitches through more degrees than the head during gallops. These basic patterns are seen in both species but are more extreme in hanumans.