Wild Common Swift Conservation Welfare

Common swifts spend almost their entire lives airborne and have one of the most specialised ecological niches of any UK bird. Welfare and conservation challenges arise from their absolute dependence on aerial insects and nest sites in buildings.

Key Facts

Swifts spend 9-10 months of the year entirely in the air, landing only to breed at nest sites
They eat, drink, sleep, and mate on the wing - their feet are adapted for clinging to vertical surfaces, not perching
UK swift populations have declined by approximately 60% since 1995 due to nest site loss and reduced insect availability
Swift nest sites are exclusively in holes in buildings, typically under eaves in older properties
Modern buildings with sealed eaves are unsuitable for swifts - building renovation has dramatically reduced nesting opportunities
Swift bricks (purpose-built nesting cavities) integrated into new and renovated buildings provide nest site replacement
Swifts return to the same nest site year after year for decades - site loss is permanently damaging to colonies
Aerial insect availability, linked to land use and pesticide use, is a key driver of swift population trends

Welfare Considerations

Swift welfare is inseparable from access to nest sites and aerial insect abundance. Individual swifts attempting to breed without suitable nest sites cannot reproduce, wasting the enormous energetic investment of their annual migration. Nest site loss through building renovation causes direct colony collapse at specific sites. The welfare of individual swifts over their 15-21 year lifespan depends on the persistence of nest sites they established as juveniles. Swift conservation is therefore also individual welfare intervention.

What You Can Do

Install swift nest boxes or bricks on buildings where swifts are known to breed or where colonies have been lost
If renovating a building with swifts, replace nest access holes with purpose-designed swift bricks
Support local swift groups that survey nest sites and advocate for planning requirements for swift accommodation
Reduce garden and farmland pesticide use to support aerial insect communities that swifts depend on