We have used CollidEscape film to great effect on our 
windows.  I definitely recommend it:

http://www.lfdcollidescape.com/

(no bird fatalities that I am aware of after installing it).

D

On Sun, 10 Oct 2010, Gail Mackiernan wrote:

> Unfortunately hawk silhouettes and other rather 
> widely-spaced items placed on glass windows have been 
> found only marginally effective in preventing bird 
> strikes, although they probably help. I recently purchased 
> some ultraviolet sticky patches which birds can see (but I 
> can't) -- however they have the same down-side in that 
> they are widely spaced. I keep the blinds on our sun porch 
> drawn (but with slats open) and this also helps but 
> wondered if anyone had any other suggestions.
>
> I know that some have suggested drawing closely-spaced 
> vertical lines on the glass with a yellow highlighter 
> (which again, birds see in the UV but are almost invisible 
> to us). Has anyone tried this?
>
> Other thoughts?
>
> Gail Mackiernan
> Colesville, MD

-- 
Prof. Derek C. Richardson
Dept. of Astronomy, U Maryland
College Park MD 20742-2421 USA
Tel: 301-405-8786 Fax: 301-314-9067
Web: http://www.astro.umd.edu/~dcr/