Figure 4.

Turns performed by male (filled symbols) and female (open symbols) C. dalmanni during walking. Shown are turns (n=145) observed from 20 males and 21 females. (a) Head turn duration did not differ between the sexes (p>0.96). (b) Mean angular velocity of the head (triangles) and thorax (squares) relative to the surrounding environment. (c) Mean angular velocity of the head relative to the thorax as the head yaw in the direction of the turn. (d) Mean angular acceleration of the head relative to the thorax. This acceleration is measured from the time the head starts to rotate in the direction of turning until it reaches the maximum speed (relative to the thorax; circles).