Glass is very dangerous for wild birds. Many birds dead between  glass and open air.So there are several solutions can use to prevent injuries to bird.

The first is the one-way glass, some birds fly in the sky can't see them, so they will crash the window. they don't know that they can't through them.And the birds maybe die ,because this one-way glass. 

The second solution is to paint colorful lines or other designs on regular window glass. In this way some birds can see the windows or some glass. they'll ready to pass the buildings before they are in the front of the building. 

The third solution is to create an artificial magnetic field to guide birds away from buildings. Humans use an instrument called a magnetic compass to determine directions—either north, south, east, or west. Bird research has shown that birds have a natural ability to sense Earth’s magnetic fields; this ability works just like a compass, and it helps birds navigate in the right direction when they fly. A building in a bird flight path can be equipped with powerful