Swift Population Declines: Causes and Conservation Responses

Common swifts have declined dramatically across Europe due to loss of nesting sites and reduced insect prey, requiring urgent conservation action.

Key Facts

Common swift populations declined by 58% in UK between 1995 and 2021
Swifts spend virtually their entire lives on the wing except when nesting
A single swift pair can raise 2-3 chicks annually in suitable nest sites
Insects make up 100% of swift diet, making insect decline directly harmful
Swifts are aerial insectivores that have tracked insect decline closely in population trends

Welfare Considerations

Swift population decline means fewer individuals able to live, feed and reproduce normally. Birds unable to find nest sites cannot breed, reducing lifetime wellbeing. Insect scarcity means greater energy expenditure per food item, reducing body condition and survival probability. Individual swifts experience the consequences of systemic ecological change over their 10-20 year lifespan. Conservation actions addressing both nesting provision and insect abundance address welfare for current and future swift individuals.

What You Can Do

Install specialist swift nest boxes on suitable buildings on north or east-facing walls
Create insect-rich gardens using native plants to support swift prey populations
Advocate for planning requirements mandating swift bricks in new buildings
Support campaigns reducing pesticide use to improve insect abundance for aerial insectivores