Barn swallows are aerial insectivores with complex nesting requirements that have declined sharply as traditional agricultural buildings are modernized, requiring active support from landowners to maintain nesting opportunities.
Barn swallows that lose nest sites after returning from migration face significant welfare stress — pairs that cannot nest after the exhausting migration have wasted substantial energy reserves. Nest site fidelity means that once a site is lost, the specific birds that used it may struggle to find alternatives. Protecting existing nest sites and installing artificial cups is a direct welfare benefit to identified breeding pairs.