Male Peregrine Falcon Falco peregrinus Fledged from a Cliff-nest Found Breeding in a Stick-nest

Abstract

We describe a case of a wild male Peregrine Falcon Falco peregrinus banded at a cliff-nest as a nestling that subsequently, as one of an adult pair, drove a pair of Australian Hobbies F. longipennis from a tree-nest and bred successfully in the Hobbies’ nest. This stick-nest was 23.4 km from the male Peregrine’s natal site. We also report a case of tree- and cliff-nesting Peregrines 2.3 km apart, and discuss whether these cases confirm or contradict current thought about the establishment of tree-nesting behaviour in Peregrine Falcons.