Migratory birds face a gauntlet of threats along their flyways including hunting, habitat loss, light pollution, and climate change that reduce survival and welfare across billions of individual journeys.
Migrating birds undergo physiological extremes - shrinking organs to save weight, flying for days without rest over open ocean. These journeys are already at the edge of what is physiologically possible. Additional stressors from habitat destruction at staging sites, light pollution causing collisions, and hunting along routes cause enormous welfare harm to billions of individual birds each season.