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This gull was photographed in Bahrain in early March 1999 by Martin Reid. it was one of the most striking first-basic birds I saw there, being very large indeed, and in having extensively dark mantle/scaps plus almost all lesser and median coverts replaced and the inner greaters also new:

in the image below it can be see towering over the many barabensis nearby - but what about that adult bird next to it; size-wise and structurally they are quite similar, but what IS this adult bird? it has the size, dull legs and extensive white in the primaries of a ponticus/cachinnans, yet the eye is clearly pale (but check these apparent pale-eyed pont./cach. here and here) and the head/bill shape looks odd for what would be a male cachinnans (due to size):

In flight note: the underwing coverts and axillaries are strongly barred; the inner primaries have the classic pattern of the ponticus/cachinnans/barabensis group, as do the plain-centred, pale-edged remaining juv. greater coverts; the striking pattern of the first-basic median and lesser coverts (of which the outermost have not been replaced yet); the broad tail band with fairly heavy barring on the central uppertail coverts;

The molt of the wing coverts is strongly against this bird being a ponticus/cachinnans; size and structure would make this an extraordinary barabensis; the paleness of the inner primaries plus the extensive dark centres to the scaps look wrong for heuglini - and the distinctive pattern of the median/lesser coverts looks wrong for any of the above - so what might this be?
Update: after correspondence with a few gullers, I feel that this is a heuglini, despite the pale panel on the inner wing and large dark centers to many scapulars. Further, I feel that the large adult bird next to it is probably a BPH-type heuglini (explaining the large amount of white in P10 from below) and that this young bird may also be a BPH-type. As always, more comments would be appreciated.