Picture windows can be death traps for birds. Be sure to locate feeders and nest boxes far away from windows. Among other measures you can take are to cover window glass with netting or transparent film, or place decals, stickers or other objects on the outside surface of the window. It is important to note that placing just one or two window stickers on a large window is not going to prevent collisions. They must cover most of the glass with the spaces between too narrow for birds to fly through. The Cornell Lab of Ornithology has more ideas for helping birds avoid window collisions.
– From U.S. Fish & Wildlife Service
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