Wild Birds

Swift Conservation: Nest Site Loss and Action

Common swifts spend most of their lives airborne, but declining nest site availability in modern buildings is driving population collapse in urban environments across Europe and North America.

Key Facts

Common swifts can remain airborne for 10 months between nesting seasons
UK swift populations have declined by 60% since 1995, primarily due to nest site loss
Modern building regulations and renovation seal traditional swift nest cavities
Swift nest boxes can successfully replace lost cavities at significantly lower cost than nest brick refusals
Swifts return to the same nest site year after year across 15-20 year lifespans

Welfare Considerations

Swifts unable to find nest sites after long migrations face the welfare impact of failed breeding attempts following an exhausting ocean crossing. Pairs that repeatedly return to find sealed former nest sites experience behavioral stress and energy expenditure in searching. Population collapse reduces the density of the social colony environment that swifts depend on for behavioral cues.

What You Can Do

Install swift nest boxes on appropriate south-facing walls before spring arrival
Advocate for swift nest brick inclusion in new building planning requirements
Support renovation guidelines that require swift cavity replacement before sealing
Participate in swift monitoring and nest site recording programs
Donate to swift conservation organizations and local swift surveys