Wildlife

Barn Swallow Welfare and Farmland Decline

Barn swallows have declined by 40% in the UK since the mid-1990s as flying insect populations crash — insect availability is the primary welfare determinant for a species that feeds exclusively in the air.

Key Facts

UK barn swallow numbers have fallen by 40% since 1995
Swallows feed exclusively on flying insects caught in aerial pursuit
Flying insect biomass has declined by 50-75% across Europe since 1990
Swallows nest in farm buildings and are sensitive to building renovation
Climate change is altering insect emergence timing relative to swallow arrival

Welfare Considerations

Swallow welfare depends entirely on flying insect abundance. In years of low insect density, adults cannot meet their own energetic needs while also provisioning chicks. Chick starvation in low-insect summers is a significant welfare event. The mismatch between swallow arrival date and peak insect availability is widening due to climate change. Farmland management for insects — wildflower margins, reduced pesticide use — is a direct welfare intervention.

What You Can Do

Reduce pesticide use in gardens and support pesticide-free farming
Plant wildflower areas to support flying insect populations
Maintain access for swallows to farm buildings through open doors and gaps
Support RSPB farmland bird and flying insect recovery initiatives