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This is a male approaching breeding plumage. The feathers on top of the head still need to wear away the brown tips and then it will be closer to full spring plumage. It is showing a rather odd plumage, though, with signs of a white throat, for example.
My Flickr photos...
oops. Fell for that. Just that other males were fully black headed in the same vicinity!
Was there a reason for entering the ID again?
Lat/Lng: 53.633, -2.839
OS grid ref: SD446154