The picture seems too overexposed for the desaturated background to enhance the birds presense in the picture. Had the leaf been desaturated it would have helped allot.
I like the color of the leaves, but I think from the point of view of making the Kookaburra stand out they could have been desaturated. The rest of the background becomes unobtruisve when desaturated, making the bird stand out.
Doesnt look desaturated, the background looks like a normal earthy toned thingy. Maybe desaturating the green leaves would underline the desaturation part?