So yesterday, the highlight was an adult winter Mediterranean Gull that was present at Thames Barrier Park briefly mid morning. There were, though, c.10 Yellow-legged Gulls about - evenly split between Thames Barrier Park and the O2. Other interesting bits about were a presumed adult hybrid Herring x Lesser Black-backed Gull at the O2 (that superficially resembled a Yellow-legged Gull), a 2nd-winter bird possibly emanating from Germany and then an adult and juvenile argentatus. But no Casp...
|sub-adult Yellow-legged Gull Greenwich O2, London 11th November 2017|
|2nd-winter Yellow-legged Gull Thames Barrier Park, London 11th November 2017|
|2nd-winter Mediterranean Gull Wanstead, London 12th November 2017|
Thames Barrier Park was really poor, with just an adult Yellow-legged Gull. So it was back to Rotherhithe where there were actually quite a lot of large gulls, about 150 in total, which included a couple of Yellow-legged Gulls - a 1st-winter and a 2nd-winter.
Last stop of the day was Burgess Park, where the annually returning Med Gull hadn't returned - not too late yet, but one of these years it won't appear.