What a crying shame Adrian that super shots like this have to suffer with such bland BG's because the light is so poor.
Have you tried to introduce a gentle colour tinge by useing the magic wand tool. If you pick up the tool and click in the picture you will find, because the BG is so uniform, that you will select the bulk of the shot. If you then press and hold the shift key and click in each of the spaces below the bird you will intoduce the ants to that area. Once completed feather your selection. Then go to your colour picker, select a very gentle shade (of blue perhaps) and useing the paint pot fill in each of the areas with the colour. Time consuming I agree but with shots of this quality I am sure you will find it will give the whole composition a lift.
Just a thought of course and in no way intended as criticism.