|female Ferruginous Duck at Thamesmere|
|1st-winter Yellow-legged Gull, Rotherhithe|
I needed some grub after this perplexing ordeal, so headed off to get a pasty, while in the meantime missed an adult Kittiwake off the golf centre. Serves me right for again not making sandwiches. Anyway, there was a nice selection of bits and pieces, including a load of large g's on the mud - including three with bling. One NTGG group Herring Gull, a Suffolk-ringed Herring Gull and then a Norwegian Great Black-backed Gull.
|JN252; ringed at Keila, Hjelmsøy, Måsøy, Finnmark, Norway on 11th June 2008 and this was the first recovery - a straight line distance of 1313 miles|
This bird was a near-adult, presumably a 4th winter with some dark smudgings on its primary coverts. Stilt legs, though not too spindly.
Then in flight this bird showed what you want in a Casp, with a nice pale tongue to the underside of P10.
Obviously this bird lacks a bit of maturity, but the wingtips seem pretty developed with an obvious pale outer web to the underside of P10. However, argentatus Herring Gulls can show pretty similar primary patterning to Casps - just compare this wing of an argentatus that I photographed in the hand yesterday.
|Extensive pale tip to P10 and lack of any black on P5 put this within the range of argentatus in the ringer's book|