I have found raptor silhouettes (made by blowing up guide book flight
profiles on a copy machine) to be very effective both at home and at the
office in reducing bird strikes. I keep a master Peregrine with a wing span
of 12.5 in. folded up in my office National Geographic guide; I offer it to
co-workers who come to me (the office bird guy) complaining of bird strikes.
They usually, though not always, also have success. No technique will work
all the time, but I promise that silhouettes (or at least copies of
Peregrines) work some of the time.

Charles Vaughan
cev at rocket.com
Woodinville, WA

John wrote:
>Seconding several other comments, we have found raptor silhouettes to be
>ineffective in reducing window strikes (which used to be frequent at our
>home on the forest edge). An alternative to the closely spaced paper or
>twine strips mentioned by several which we have found to be quite effective
>is the following. Attach one strip of mylar tape (available in garden
>stores) per window, either pinned only at the top or pinned top and bottom
>with some slack. The shimmering of the tape seems to alert approaching
>birds.