Movie 2.

Animated stick-figure of the quadrupedal-bipedal transitions of Babar (16.12 kg; upper level of the size range of the of the baboon group, 0.75 m/s), Dede (7.26 kg; middle of the size range of the of the baboon group, 0.40 m/s) and Filosophie (3.59kg; lower level of the size range of the of the baboon group, 0.56 m/s). For data on individuals see table 1 of supplementary material S1).