Wild Barn Swallow Farmland Welfare: Breeding Success and Decline

Barn swallows are iconic farmland birds whose breeding success is closely tied to the availability of insects, open farm buildings, and muddy puddles. Their welfare reflects broader farmland ecosystem health.

Key Facts

UK barn swallow populations have declined by 46% since 1970, mirroring farmland insect declines
Swallows require open farm buildings such as barns and stables to nest; modern sealed buildings exclude them
A pair of swallows can raise 2-3 broods per season, each of 4-5 chicks
Chicks are fed entirely on aerial insects - each chick needs up to 200,000 insects to fledge
Muddy puddles are essential for nest construction - drainage of farmland reduces their availability
Swallows winter in southern Africa and are affected by conditions across their entire migratory route
Adult swallows feeding chicks can make over 400 feeding visits per day

Welfare Considerations

Barn swallow welfare is determined by insect abundance and access to nesting sites. In landscapes with low insect availability, breeding pairs must travel further for food, reducing chick feeding rates and increasing the risk of chick starvation. Nest failure through insect scarcity causes real welfare harm to dependent chicks. The connection between farmland insect decline and swallow welfare makes pesticide reduction one of the most impactful welfare interventions available.

What You Can Do

Leave farm building access points open for swallows during the breeding season (April to September)
Create or maintain muddy puddle areas near farm buildings for nest material
Reduce or eliminate insecticide use near farm buildings during swallow breeding season
Record swallow nest sites and breeding success through the BTO Nest Record Scheme