Barn swallows are aerially specialised farmland birds whose welfare is directly linked to flying insect abundance and the availability of traditional farm buildings for nesting.
Barn swallow welfare on British farmland is determined by two factors: insect food abundance and nesting access. Both have declined as farms have intensified and old buildings have been converted or demolished. Individual swallows that return from Africa to find their nest site demolished, or that struggle to provision chicks in an insect-depleted farming landscape, experience direct welfare costs - energy expenditure without reproductive return, or chick starvation. Maintaining old farm buildings with swallow access, creating insect-rich habitats through reduced pesticide use and diverse crops, and protecting traditional farmscapes preserves the welfare foundation for one of summer's most iconic birds.