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Windows dangerous for birds

02.03.2010 - 14:01 |  Looduskalender
Text and photos: Vello Keppart
Translation: Liis
 
Large windows and glassed areas that mirror the outdoor landscape are ever more used in buildings. A rapidly flying bird doesn’t notice the glass, and in the collision they are concussed, otherwise injured or killed. Studies of birds killed in cities show that there are often haemorrhages inside the skull, more rarely injuries to air sacs and other parts.
 
Figure 1. Birds are deceived by the mirrored image in the window as well as by the lights in the opposite windows, seen through the building.
 
Figure 2. "Angel” image with a 91 cm wingspan on window points to a  crow-sized bird having collided with the window.
 
The light pollution from cities and high-rise buildings disturbs the migration of birds and lures moths and other insects into the light trap. Only bats sometimes make use of the light paths to feed on insects there. 
Measures and recommendations to be used in building to avoid the death of living creatures are discussed in the source below.
Recommended reading: Schmid, H., Waldburger, P., Heynen, D.(2008). Vogelfreundliches Bauen mit Glas und Licht. Schweizerische Vogelwarte, Sempach.

Downloadable as http://www.windowcollisions.info/public/leitfaden-voegel-und-glas_dt.pdf


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