Peregrine falcons recovered from near extinction due to organochlorine pesticide poisoning.
Peregrines suffering organochlorine poisoning experienced progressive neurological deterioration and reproductive failure before the pesticide cause was identified. Today, illegally persecuted birds are shot, trapped, and poisoned. Disturbance at nest sites causes chick deaths from exposure and predation. Maintaining the welfare of recovered peregrine populations requires vigilant protection against both persecution and disturbance.