Songbird Migration: Threats and Welfare of Long-Distance Travelers

Migratory songbirds complete extraordinary journeys of thousands of miles twice yearly, facing a gauntlet of anthropogenic threats that cause massive mortality and individual suffering.

Key Facts

Over 650 songbird species migrate through North America annually, with some traveling from the Arctic to South America
Migrating birds fly through the night using magnetic sense, star patterns, and learned landmarks for navigation
Building strikes, cat predation, light pollution, and pesticide exposure are the primary anthropogenic mortality causes
An estimated 600 million birds die from window strikes annually in the US — the second largest human-caused bird mortality
Light pollution disrupts migration by attracting birds to urban areas where they become exhausted and disoriented
Habitat destruction at stopover sites can devastate populations as birds have no alternative refueling locations

Welfare Considerations

Migratory songbirds face individual welfare challenges at every stage of their journey. The physiological demands of long-distance migration are extreme — birds lose half their body weight during some crossings. Disoriented by artificial light, exhausted and hungry in cities without stopover habitat, striking windows that they cannot perceive as barriers — migrating birds experience individual suffering on a massive scale. Much of this suffering is preventable through relatively simple interventions: window films, turning off lights during migration season, and maintaining stopover habitat. The aggregate welfare benefit of these individual actions, multiplied across migration routes, is enormous.

What You Can Do

Apply window collision prevention films or patterns to glass in your home and workplace
Turn off or reduce exterior and interior lighting during peak migration periods (spring and fall)
Maintain or restore native vegetation that provides food and shelter at migratory stopover sites
Keep cats indoors, especially during spring and fall migration periods
Participate in lights-out programs in your city during peak migration periods