What other hazards do Loop buildings pose for birds? Many birds that are killed at Loop buildings are small migrants from the tropics – warblers, thrushes, tanagers and others. Over 250 species migrate through Chicago, about 5 million individuals in all. They circle the buildings repeatedly and die of exhaustion or collision. It is thought that the lights on tall buildings confuse the navigation systems of birds unlucky enough to have these buildings in their flight path. Why are tall buildings a trap for migrant birds? Birds that are decreasing their elevation to settle in to rest after their long migratory journey will have reduced risk of colliding with windows. Buildings with lighted atria can save birds by reducing atrium lighting in the early morning hours.īased on research, we recommend that during the Lights Out migration periods, lights be turned off (or blinds drawn) in all perimeter office and residential space on all Floors from 4 am to full daylight.
and from August 15 to November 15, leaving the lights off until daylight. Short buildings along the lakefront (with extensive glass exteriors) can save birds by extinguishing exterior lighting and extinguishing interior lighting or drawing blinds from March 15 to June 15 each evening after 1 a.m. These recommendations apply to all buildings of 40 or more stories and to buildings of 20 or more stories that are isolated from other buildings.
Tenants on the upper floors are encouraged to turn out lights or draw blinds after 11 p.m. each evening and leaving lights off until daylight from March 15 to June 15 for the spring migration, and again from August 15 to November 15 for the fall migration. Tall buildings can save many birds by extinguishing decorative lighting on the upper stories after 11 p.m. Chicago’s Lights Out program is the first in the nation. Since 2000, the managers of many of Chicago’s tall buildings have served as examples to the nation of how birds’ lives can be saved. A program of the Chicago Audubon Society in cooperation with the Mayor’s Nature and Wildlife Committee and the Building Owners and Managers Association of Chicago Lights Out After 11 p.m.
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