Fig. 5

The relationship between head- and body heading. (A) 100 min of an individual oryx movement data showing the incidence and extent of change in head heading in relation to the body heading. The lower panel shows the Vectorial Dynamic Body Acceleration, a proxy for movement speed. (B) Data on all changes in head heading from 6 oryx, each over a mean of 5.15 animal hours (SD 0.15), in relation to the extent of the subsequent change in body heading showing the correlation between them (see text for details). This representation also has the area divided into four quadrats to help understand what each point means. Data in the bottom left and top right quadrats constitute cases where the head heading changes are in the same direction as the body heading whereas data in the top left and bottom right quadrats constitute cases where the head heading changes are in a direction opposite to the body heading. Note that a very small percentage of points have the head looking back over the animals’ shoulders (with a DaHwB of 180°). These values are due to the animals indeed looking back over their shoulders but may have more error in heading because at this time the collar may be pressed against the body, displacing it from its normal position on the neck to some extent