Common Swift Ecology and Conservation Welfare 2025

Key Facts

• Swifts spend up to 10 months per year in continuous flight, sleeping and eating on the wing
• A single breeding pair needs just one nest cavity but returns to the exact same site year after year
• Chicks can survive nest abandonment during cold snaps by entering torpor for up to 12 days
• Swift populations have declined 60%+ in the UK since 1995, primarily due to building renovation
• Installing swift nest boxes before April is the most effective individual conservation action

Welfare Considerations

Swift welfare intersects with conservation: the species has no welfare concerns in the wild beyond population-level threats. Their extreme fidelity to nest sites means building renovation without mitigation is catastrophic — birds returning to find their nest cavity sealed may attempt entry repeatedly before abandoning. Grounded adult swifts cannot take off from flat surfaces, making ground rescues necessary but stressful. Climate change affecting aerial insect abundance is an emerging welfare and population threat.

What You Can Do

• Install RSPB-approved swift nest boxes or bricks on north or east-facing walls at height 5m or more
• Play swift call recordings (lure calls) in late April-May to attract prospecting birds
• Never block swift nest holes between April and September — check for nesting birds first
• Contact a local swift rescue group if you find a grounded swift
• Support organizations working to mandate swift bricks in new-build housing legislation