Wild Animal Welfare: Swift Conservation and Nest Sites

Swifts spend almost their entire lives in the air, only landing to breed. Their welfare depends critically on nest site availability in older buildings.

Key Facts

Swifts (Apus apus) sleep, eat, and drink on the wing - they only land to breed
UK swift populations have declined by over 50% since the 1990s
The primary cause of decline is loss of nest sites in buildings through renovation and demolition
Swifts cannot enter new buildings - they require specific openings under eaves or in walls
Swift bricks can be incorporated into new buildings during construction at minimal cost
Swifts return to the same nest site year after year - loss of a single site eliminates a colony permanently

Welfare Considerations

Swift welfare is almost entirely a nest site availability issue. Swifts that return from sub-Saharan Africa after a 10,000km migration to find their nest site blocked by renovation work cannot breed that year and may be displaced permanently. The welfare cost of failed breeding for individual birds - and the population-level effects of colony collapse - represent serious welfare harms that are almost entirely preventable through sympathetic building management. Planning regulations requiring swift-compatible bricks in new developments, combined with retrofit of swift boxes on older buildings, are the primary welfare interventions. Local swift groups coordinate installation and monitoring, providing a community welfare action framework.

What You Can Do

Install a swift box on your home following RSPB guidance before the breeding season
Join a local swift group to participate in colony monitoring and advocacy
Advocate for swift bricks to be required in new residential and commercial developments
Report swift colony locations to your local planning authority for site protection
Donate to the RSPB Swift Action Fund for research and advocacy