The barn swallow is a beloved symbol of summer but has declined 17% since 1995. Its welfare depends on aerial insect availability over farmland, mud puddles for nest building and accessible barn structures for nesting.
Barn swallow welfare is directly linked to livestock farming practices. Traditional cattle and horse pastures support fly populations that swallows depend on for food. Modern clean dairy units with fly control programmes reduce the prey available to swallows foraging nearby. Barn renovations that seal entry points prevent nest site access — pairs that return to find buildings sealed face breeding failure for that season. Dry springs prevent mud collection for nest construction. Providing a muddy puddle near nesting sites and maintaining open access points in barns directly improves swallow breeding success. Insecticide reduction on farms increases prey availability and is the most impactful welfare action for this species.