Wild Peregrine Falcon Welfare: Urban Recovery and Ongoing Threats

Peregrine falcons made one of conservation's most spectacular recoveries after DDT nearly eliminated them. Today's urban peregrine populations face a different set of welfare challenges from building hazards, poisoning, and nest disturbance.

Key Facts

Peregrines were reduced to around 400 breeding pairs in the UK and near-eliminated from the eastern US by DDT-induced eggshell thinning; post-DDT, they have recovered to over 1,500 UK pairs
Urban peregrines now nest on skyscrapers, power stations, and cathedral spires across Europe and North America, feeding on pigeons and starlings
Rodenticide poisoning — from eating rodents that have ingested anticoagulant poisons — is a significant cause of raptor mortality including peregrines
Glass buildings cause millions of bird deaths annually from collision; peregrines striking glass at speed are killed outright or suffer fatal injuries
Nest camera programmes at urban peregrine sites have produced extraordinary public engagement and welfare monitoring data
Peregrine eggs and chicks are occasionally taken illegally for falconry or egg collections; this is a serious wildlife crime with significant welfare consequences

Welfare Considerations

Urban peregrine welfare is primarily threatened by the built environment they have colonised so successfully. Glass collisions are a significant cause of peregrine mortality — birds pursuing prey at high speed cannot perceive glass as a barrier. Second-generation anticoagulant rodenticides (SGARs) accumulate through food chains, causing internal bleeding that may go undetected until advanced; peregrines feeding on urban pigeons regularly test positive for multiple rodenticides. Nest disturbance — by building maintenance work during the nesting season, by unwanted human attention, and occasionally by deliberate nest interference — causes chick mortality and adult stress. The management response involves planning law protections during nesting, bird-strike window film on high-collision buildings, and advocacy for safer rodenticide regulation. Individual injured peregrines that reach rehabilitation centres have reasonable recovery prospects for many injury types.

What You Can Do

Support campaigns for safer rodenticide regulations that protect raptors from secondary poisoning
Advocate for bird-safe building design standards for new buildings with large glass facades
Report peregrine nest disturbance or suspected egg theft to the police wildlife crime unit
Follow urban peregrine nest camera programmes — they provide extraordinary welfare monitoring and public engagement
Join local raptor monitoring groups that contribute to population tracking and welfare surveillance