ANN ARBOR – During the spring and fall migrations, more than 250 birds migrate at night over Michigan. Brightly-lit tall buildings disorient the birds and some will circle these buildings until their either die from colliding with the structure or from exhaustion. According to scientists, hundreds of millions of birds die annually as a result of these encounters with tall buildings. AdProperty owners of tall buildings as well as residents or office workers are encouraged to turn off their lights or close their shades after 11 p.m. during Safe Passages Great Lakes Days. Those who work in tall buildings at night are also encouraged to use desk lamps or other dim lights to minimize perimeter lighting at night.