Birds versus windows
Skyscraper windows kill fewer birds every year than the windows on low-rise buildings

On the left is a painted bunting. On the right is a Canada warbler. Such birds that migrate between continents are more likely to smash into windows, according to a new study. The study also turned up the surprising finding that lower-rise buildings — not skyscrapers — are responsible for the vast majority of bird deaths by window.
CRAIG ONEAL/FLICKR, JEREMY MEYER/FLICKR