Figure 5.

Risk-averse flight behaviour in foraging movements. (a) Scaled kernel density plot for outbound (blue) and inbound flights (green) shows individuals flew in a more risk-prone manner (i.e. lower RAFI values) during inbound flights. (b) RAFI as a function of flight altitude of breeding individuals (blue) and non-breeding individuals (red). Breeding status had no effect on RAFI at high flight altitudes, but non-breeding vultures were more risk-prone at low-flight altitudes. Horizontal lines mark RAFI values of zero and unity that represent optimal (‘MacCready’) speed and best-glide speed, respectively.