|Adult Caspian Gull at Rainham today, with argenteus Herring, graellsii Lesser Black-backed, Black-headed and Common Gulls. Note the head and bill profile, small dark eye, dull yellowish legs and general posture/jizz.|
|Wing-tip detail of the same bird as it flew. P10 has the classic extensively white tip shown by most adult Caspians, and P9 has a large white mirror across both webs. The black subterminal band on P5 is complete.|
|Open wing-tip on the same bird. Note that black markings just extend to P4.|
|A sub-adult michahellis Yellow-legged Gull, with dark bill markings and black on the primary coverts.|
|First-winter Caspian Gull (centre) with first-winter Herring Gull (behind). A useful comparison shot: note the Caspian's whiter underparts, more solidly brown wing coverts, different scapular pattern, 'shawl' of hindneck streaking and bill and eye. This is a Polish-ringed bird, 65P6, ringed in May 2010 in Upper Silesia.|
|The same first-winter Caspian, this time showing the upperwing and underwing patterns, and tail.|
|One for the road: a monster adult or near-adult argentatus Herring Gull. This taxon is common at Rainham.|
Below: click the 'play' button for a movie clip of today's adult Mediterranean Gull.