About Bird Collisions

Never had a bird hit your window? It's possible that you may be one of the lucky few, but chances are, birds have hit the glass on your house and you just don't know it. They may have flown away injured to die elsewhere, or been eaten by a cat, raccoon, crow, or skunk before you found them. Your house may kill a dozen or more birds each year without you knowing. This may not seem like a lot, but it adds up … to as many as a billion birds per year or more throughout the United States. Much of this mortality takes place during spring and fall when songbirds are migrating. Read more about bird collisions with glass.

Birds hit your windows because they can't see glass. They try to fly to reflected sky or trees, or they see through windows on opposite sides of your house and try to fly 'through the hole'. The impact of the collision is enough to kill a songbird, severely injure it, or stun it to leave it on the ground vulnerable to predators.

But now there is a solution!

ABC BirdTape was designed and tested by bird experts at American Bird Conservancy, the leading bird conservation organization in the U.S. It keeps birds from flying into glass effectively and affordably.

Apply ABC BirdTape in one of the recommended patterns or your own pattern following ABC guidelines, and birds will see a barrier to avoid, not space to fly through. In a scientific evaluation of the ¾” tape conducted in Austria, 81% of birds tested avoided vertical stripes spaced 4” apart.

Bird Collision Facts

  • Glass kills between three hundred million and a billion birds each year – the majority on home windows.
  • Birds can't see glass and don't understand the architectural cues, such as window frames, mullions, and handles, that help people detect it
  • Unlike some sources of bird mortality that predominantly kill weaker individuals, there is no distinction among victims of glass. Because glass is equally dangerous for strong, healthy, breeding adults, it can have a particularly serious impact on populations.
  • Even small windows can be dangerous to birds that are accustomed to flying through small gaps between trees and shrubs.
  • One or two decals on a small window may help reduce collisions, but become less effective as window size increases because birds will simply try fly around them.
  • Tape is a cost effective way to make windows safe for birds and it is a quick way to treat large areas of glass.
  • Research has shown that birds generally avoid flying through vertical lines 4" apart or less, and horizontal lines 2" apart or less.

  • This BBC video of an experiment with a captive Goshawk demonstrates perfectly how birds are able to fly through very small spaces, and why it is important to space BirdTape appropriately on windows