Barn Swallow Welfare: Aerial Insect Decline and Breeding Challenges

Barn swallows are an iconic farmland bird whose welfare is directly linked to aerial insect abundance, with population declines reflecting the dramatic loss of insect biomass over recent decades.

Key Facts

UK barn swallow population has declined by approximately 30% since the 1980s
Aerial insect biomass in Europe has declined by an estimated 70-80% over the past three decades
Swallows need open access to farm buildings or traditional structures for mud-cup nesting
Cold, wet summers with reduced insect availability are directly linked to chick mortality and reduced breeding success

Welfare Considerations

Barn swallow welfare is fundamentally linked to aerial insect abundance. In low-insect years, adult swallows must fly further and for longer to provision chicks, reducing feeding frequency and increasing chick starvation risk. Cold, wet conditions reduce insect activity, compounding food stress. Barn conversions and building modernisation have removed traditional nesting sites across the agricultural landscape. Chicks that fledge in poor condition face elevated mortality on migration to sub-Saharan Africa. Reversing aerial insect decline through reduced pesticide use and insect-friendly farming is the most fundamental welfare intervention for this species.

What You Can Do

Reduce pesticide use in gardens and agricultural land to support aerial insect recovery
Maintain open access to farm buildings and install swallow nest platforms where renovation closes natural sites
Create wet mud sources near nest sites to provide nesting material for swallows
Support agri-environment schemes that restore insect-rich mixed farming landscapes