The peregrine falcon (Falco peregrinus) is the fastest animal on Earth, reaching speeds exceeding 320 km/h in a hunting stoop. It is a cosmopolitan species, found on every continent except Antarctica. In the UK, peregrines traditionally nested on sea cliffs, inland crags, and quarry faces. Since the 1990s, they have dramatically colonised urban environments ā cathedrals, tower blocks, bridges, and power stations now host nesting pairs across many British cities.
Peregrines declined catastrophically in the 1950sā1960s due to organochlorine pesticides (DDT, dieldrin, aldrin) that accumulated through the food chain, causing eggshell thinning and breeding failure. The UK population fell to around 360 pairs. Following the ban on organochlorines, recovery began ā with active support through legal protection, persecution control, and nest protection projects.
This recovery represents a genuine welfare success: tens of thousands of individual peregrines alive today that would not have been without conservation action.
Peregrine persecution on grouse moors and around racing pigeon interests remains the most significant ongoing welfare threat. Methods include:
RSPB Investigations team and local raptor study groups monitor persecution incidents. Satellite-tagging has provided clear evidence of deliberate killing, with tagged birds disappearing in suspicious circumstances on managed grouse moors.
Second-generation anticoagulant rodenticides (SGARs) accumulate in prey species (particularly pigeons and rats) and cause secondary poisoning in peregrines and other raptors. Post-mortem studies consistently show SGAR residues in urban peregrines. Fatally poisoned birds suffer internal haemorrhaging. Reducing SGAR use in urban environments benefits peregrines and other wildlife.
Urban nest sites attract significant public interest ā often positive (webcams, viewing points) but sometimes leading to welfare-harmful disturbance. Peregrines are sensitive to direct approach to nest sites during incubation and early chick-rearing. Licensed access for monitoring is appropriate; unlicensed disturbance is illegal and welfare-compromising.
Nest boxes on tall buildings, bridges, and structures provide secure nesting ledges where natural ledges are absent. Many cathedral and city peregrine projects involve nest box provision alongside public engagement. Nest boxes help establish new urban territories and can be fitted with webcams for public engagement and monitoring.
Urban peregrine projects (coordinated by Hawk and Owl Trust, local wildlife trusts) combine nest provision, webcam installation, and public engagement. These projects generate enormous public interest and goodwill toward raptors, supporting broader raptor conservation culture.