Blackbird Mystery

I have never seen a blackbird with a gray head before so I have been trying to capture this rather odd looking blackbird for some days, to get a good look at his head.  It seems the feathers haven't developed properly. Or perhaps he has mange? There is another view in the extras.

Today, I spotted him in his bath, grabbed the camera and managed to get a few shots.

I am posting early today as I have visitors coming later.