From 1 to 26 November 2003 the vulture colony was surveyed for dead vultures along all or part
of its length on 11 occasions. Daily surveys were conducted along the entire 42.5 km of colony between 27 November 2003 and 30 June 2004. All vulture carcasses located were counted and
then removed or marked to prevent double-counting. Cause of death was determined by
necropsy examination on the majority of carcasses using the protocols outlined in Gilbert et al.
(2002). It was not possible to conduct necropsies on every dead bird, as some became tangled in
dead branches and could not be immediately recovered, and others were partially consumed by
feral dogs soon after death.