Release Techniques

The Peregrine Fund has used three methods for releasing birds of prey. The most
frequently used method, HACKING, is a process that was developed by falconers hundreds
of years ago for falcons. Young are placed in a hack box on a tower or cliff and fed by attendants until their flight and hunting skills are developed to the point where they become independent.
DIRECT FOSTERING consists of adding young into the nest of identical raptor species to increase natural production. For Peregrines it was done when thin-shelled eggs were removed and taken to the lab for hatching. Three-week-old Peregrine Falcons were exchanged for thin-shelled eggs.
CROSS FOSTERING is similar to direct fostering except the foster species young are replaced by those of another.
Modified forms of these techniques are being used for many species of wildlife.
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