This gull has been around for a few weeks, joining the two that have oversummered in Deep Bay. It has very pale plumage (whitish) with darker subterminal marks on the upperparts, and on this basis I had thought it was a Mongolian Gull.
I'm slightly confused by age though, because I thought the body looks like a first winter, but the stage of moult does not seem to be correct for that age. Author: jsk_ppp Time: 7/09/2016 23:57
Thank John for the reply. I have two more photos, but I guess they won't be of any help.