This 2cy Yellow-legged Gull has been regular at Chiswick Eyot in recent days. It's quite a distinctive bird with heavily marked scapulars and worn flight feathers - the primaries are quite bleached, for example. Covert moult has commenced, as is evident in the pics below.
I've also had up to three at the Wetlands Centre lately, so they appear to be on the move. This presumably ties in with Lesser Black-backed Gull migration, which also seems to be well underway. Small pulses of birds have been passing through my stretch of the Thames and I had blue-ringed 2cy V.JZ4 last week, which is apparently from Denmark (awaiting details on that one).
2cy Yellow-legged Gull, Chiswick Eyot
A large and aggressive bird, here it is pictured bullying a 2cy Herring Gull
