Wild Bird Migration: Welfare Threats Along Flyways

Billions of birds migrate annually along global flyways, facing a gauntlet of threats from hunting, habitat loss, light pollution, and climate change that causes mass mortality and suffering.

Key Facts

Approximately 5 billion birds migrate through North America alone each spring and fall, with billions more moving along European and Asian flyways.
An estimated 1 billion birds die from building collisions annually in North America — the second leading human-caused bird mortality after cats.
Light pollution disorients nocturnal migrants, causing fatal building strikes and exhausting birds that circle illuminated structures for hours.
Illegal bird trapping along Mediterranean migration routes kills an estimated 25 million birds per year, with key hotspots in Cyprus, Egypt, and Italy.
Climate change is shifting the timing of insect emergence and plant flowering, creating mismatches with bird migration timing that reduce food availability at critical stopovers.
Migratory birds accumulate physiological stress across thousands of kilometers, making stopover habitat quality critical for survival and subsequent reproduction.

Welfare Considerations

The welfare experience of a migratory bird spans thousands of kilometers and involves periods of intense physiological stress — extreme energy depletion, navigation challenges, predator pressure, and exposure to weather. At stopover sites, birds in poor condition must rapidly refuel to continue migration, making habitat quality at these sites disproportionately important for individual welfare and population survival. The threats birds face are overwhelmingly human-caused and largely preventable: building strikes can be reduced through glass modifications; light pollution can be mitigated through lights-out programs; illegal trapping can be reduced through law enforcement and public awareness. Each individual bird lost to these causes represents genuine suffering — exhaustion, disorientation, injury, and death — that responsible human society has the capacity to prevent.

What You Can Do

Make windows visible to birds using decals, screens, or bird-safe glass — particularly during migration seasons.
Participate in your building's or city's lights-out program during spring and fall migration.
Support BirdLife International and the American Bird Conservancy campaigns against illegal bird trapping.
Plant native vegetation in your garden to provide stopover habitat and natural food sources for migrants.
Report building strikes to eBird or Fatal Light Awareness Program databases to help researchers quantify mortality.