At many eyries visited, the female peregrine appeared to have a "favourite tree" where she tended to perch during the day. At all the sites visited, this tree was located above the cliff, on a horizontal, usually dead, branch with a commanding view. The area underneath these trees were good areas to collect casts for analysis. The presence of the casts indicate that the birds spend considerable time there.
On three occasions, females were sighted leaving these points to undergo food exchange from the male in mid air. In the three cases that this happened, the female went to the cliff to pluck prey not to her "favourite" tree.
It was usually the female that responded to the presence of humans during the study. The male in a lot of cases was absent (away hunting) but reappeared upon hearing the female screaming at the intruder. His attacks were nearly always subdued compared to the females' attacks, with him preferring to circle above protesting with constant heckling. In only one nest site was the male more aggressive than the female.
At site 11, there has been a change of females. The previous female was very vocal and aggressive compared to here replacement. At this site, the new partner is using a different ledge to the last female.
4.6 Impact of Disturbances at Nesting Sites