You would have to select everything but the Osprey and it's perch (I'd use a new layer) and then under "Filters" there is a "Blur" option. You would probably want to select "Lens Blur". I don't really believe this image needs more blurring, but you could try it to see if you like the results.
Hmmm.. If you don't think so, I expect I'll leave it. I may play with a copy just to see what happens though.
I took a total of 192 pictures of it from different angles and did take some without the bridge in the background. I had to be 75 feet further with that angle though and I expect I'll lose some detail if I crop it that hard.