Vulture positions determined from GPS-PTT fixes were analysed using Ranges6 software v1.2
to characterize the movement and space use of individual vultures during provisioning and
control periods (Kenward et al. 2003). A measure of daily movement distance was calculated for
all days during which 10 or more fixes were obtained by summing the distances between
successive fixes. Home-range area was calculated using minimum convex polygons (MCPs) that
calculate the smallest polygon with external angles greater than 180u to include all fix locations
(Kenward 2001). Tracking resolution was set at 20 m to take account of GPS tracking unit
accuracy.