Barn Swallow Welfare: Farmyard Decline and Conservation 2026

The barn swallow has declined significantly in the UK as traditional farming practices change, reducing nesting sites and insect prey.

Key Facts

UK barn swallow populations have declined by around 50% since the 1970s, particularly in lowland areas
They require open farm buildings for nest attachment and low-flying insects over water and grassland
Swallows make 2-3 breeding attempts per year from April to September before migrating to South Africa
Farm building modernisation seals nesting access, while pesticide use reduces flying insect prey
Flying insect abundance has declined by 60-70% in UK farmland since the 1970s

Welfare Considerations

Barn swallow welfare is primarily threatened by the convergence of nest site loss and prey availability decline. Swallows that return to traditional farm sites to find buildings sealed, or that arrive on breeding grounds unable to find sufficient insect prey, experience welfare compromise through failed breeding attempts and energetic depletion. The long migration from southern Africa adds further welfare risk - swallows crossing the Sahara are dependent on brief insect abundance at stopover sites that are also affected by changing rainfall patterns. Farm-level interventions that maintain nest access and support insect-rich habitat around farms are the most impactful local welfare actions.

What You Can Do

Maintain access points for swallows to traditional farm buildings and outhouses
Install artificial swallow nest sites and half-cup nests under eaves where natural sites are limited
Support insect-rich grassland and pond management on farms to provide swallow foraging habitat
Advocate for agri-environment payments prioritising flying insect habitat creation and farmyard access