![]() “That’s why artificial light from our buildings disorients them.” “When they’re migrating at night, they use the stars and moon to navigate,” Barrientos said. To create bird-friendly buildings, Audubon recommends they "turn off exterior decorative lighting, extinguish spot and flood-lights, substitute strobe lighting where possible, reduce lobby and atrium lighting wherever possible, turn off interior lighting especially on upper floors, substitute task and area lighting for workers staying late or pull window coverings, down-shield exterior lighting to eliminate all light directed upward and horizontal glare, and install motion sensors and automatic controls wherever possible.Lights at night can throw birds into confusion and exhaust them leaving them vulnerable and depleting their energy during a journey of thousands of miles, according to Barrientos. Lights Out works on mitigating this problem by requesting building owners and managers turn lights off during the migration season from midnight to 6 a.m. If they aren't killed, their flight patterns are disrupted, causing them to become disoriented and circle in confusion and interfering with their daytime cycle of resting and refueling. Attracted by the bright, artificial lights at night, birds fly into buildings and glass windows and are often killed by the impact. ![]() After feral cats, buildings and windows are the second-greatest killer of American birds, especially during the two times a year when they migrate, flying between breeding and wintering habitats.
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