Check out Bud Anderson's/ the Falcon Research Group's work with what Bud has dubbed Long-billed Hawk Syndrome. It's been ongoing for several years now.
There's a page on this topic on the FRG website:

http://www.frg.org/LB_synd.htm

Martin Muller, Seattle
martinmuller at msn.com

On 11/10/10 D. Lewis wrote:
>
> I had read the story on the beak deformity after we saw this redtail at the west 90 (Skagit) area last weekend. I didn't notice it when I was taking the picture but we did when we got home. It does have a deformed upper beak. I looked at the bill up close and it doesn't look like it has any damage or injuries. Here's a picture off the bird:
>
> http://s255.photobucket.com/albums/hh152/DDLewis1/?action=view&current=hawk-9.jpg
>
> I'll submit the information and send them a picture. I hope to get some follow-up information from the study.
>