I am assuming that you have this in RAW
if so adjust the exposure to see if you can get the right side acceptable, ignoring what this might do to the rest.
if you can get anything out of the highlight area you can then take both exposures, one for what you see here and the other for the highlight fix
and merge them together by lassoing just the bright areas and pasting them on top of this image.
Don't be afraid to get a little bit more shadow in this one as well.
If after playing with all the exposure and curve settings in RAW you can not get it to look good then - Thusie's suggestion is about the only other thing you can do. If your having a hard time with it send me the Raw and I'll let you know if its possible. (I'm thinking it might just be too much though)
A trick G told me about for blown highlights if there aren't a ton..Take the color picker and find that color just under being blown then with a brush paint it on using say between 20-35%. If there is detail you can do the same thing with the clone tool.
Gotta love hawks, side lit, back lit, to far, real PITA