Wild Barn Swallow Migration Welfare

Barn swallows undertake one of the longest migrations of any passerine bird, travelling from UK breeding grounds to sub-Saharan Africa and facing welfare challenges throughout the journey.

Key Facts

Barn swallows travel around 10,000 km between UK breeding grounds and South African wintering sites
Mortality during migration is estimated at 40-50% per year in adults and higher in first-year birds
Climate change is affecting insect availability along traditional migration routes
UK swallow populations have declined by 50% since 1970 due to reduced insect prey in agricultural landscapes

Welfare Considerations

Swallows during migration face exhaustion, starvation when insect prey is scarce along routes, and mortality from severe weather events. Saharan crossing is the highest-risk part of the journey, requiring fat reserves accumulated in the Sahel region. Agricultural intensification that reduces insect abundance in the UK means swallows arriving to breed have reduced condition that affects reproductive success. Individual swallow welfare is determined by conditions across four continents.

What You Can Do

Maintain or create swallow nesting access through open barn doors and purpose-built nest cups
Support insect-rich farming practices that improve swallow breeding habitat
Engage with Swallow Action and BTO tracking projects contributing to migration welfare understanding
Advocate for biodiversity protection across swallow migration routes through international conservation support