Your results were very good dave, but the time involved. Have you ever tried the quick mask feature?
Trace the squirrel with the lasso tool. Click on the quick mask(the selection will turn red)>>>blur>>>guassian blur, to feather the edges (40-80)>>>click off quick mask>>>layer >>>layer mask>>>reveal selection. Now you have a layer, with a mask of the squirrel, that your can make any adjustment to, without effecting the background. Make a duplicate layer and invert the mask for the opposite. Much quicker and prob. the same results.
Nice shot by the way, i too liked the holly leaf.