A Flickr group highlighting bird imprints on glass exists. Reflective glass and windows are especially dangerous. Birds often fly into glass windows and are killed. The images are fascinating and provide a testament to how destructive buildings can be to birds. Certainly if we can have dolphin-safe tuna we can have bird-friendly architecture and bird-friendly architecture exists. From NPR:

…[Ornithologist Daniel Klem] watched more than 100 birds hit the windows of a “typical” suburban home in the course of a single year. Then he studied shiny glass office towers, which can kill tens of thousands of birds in a year. It all adds up a yearly death toll of at least 1 billion, he argues, or roughly five percent of all the birds found in the United States each fall. Hardly anybody appreciates the size of the problem, he says.

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