Up to 100 million birds die each year in collisions with buildings in the U.S. and Canada. In fact, collision with glass is a major cause of avian mortality. The problem is reflection, which birds mistake for cover or open sky.

But there are some steps you can take to help prevent these fatal mishaps. First, notice which windows are repeatedly struck so you can get a bird’s-eye view of the problem. For example, seeing one window through another can be mistaken for a flight path. The simple remedy is closing a door or pulling a shade.

Shade cloths also cut a window’s reflection while still allowing you to see through. Placing moving objects or predator mobiles just inside a window can provide a deterrent. But flowers, animal cages or fish tanks can lure birds in and should be kept away from windows.

These simple steps can help ensure our feathered friends fly safe.