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I cannot be sure if this bird from Bahrain in early March is a Big Pale Heuglini-type or a barabensis. Statisically the odds favor the latter, but I feel that the following features point to heuglini:- the molt score - none of the hundreds of adult barabensis I saw were still growing P10, but a handful of heuglini were at a similar stage to this bird (and at least one bird had a much lower score); size and shape of the bill/head (a lot of overlap here, but this bird is at least in range for both forms); the bill base being slightly paler yellow than the tip; the extensive flesh tones to the feet (on a bird with relatively little black in the bill); the degree of darkness to the underside of the secondaries and inner primaries (given that the underwing coverts look very white in this exposure); the slightly more-staggered pattern of black on the underside of the primaries (like heuglini, barabensis tends to have an almost solid black P10, but with the gray tongues of P9 and P8 slightly more extensive and almost as long as each other). Points in favor of barabensis are the apparently dark eye (but the strong shadow may be affecting this) and the apparent lack of nape-streaking (but we cannot see the center of the nape; in early March some heuglini had streaking restricted to the lower center of the nape, and a few were already without any markings). I feel that if this is a heuglini then the mantle tone, large double-mirrors, and rather limited black in the primaries indicate the Big-Pale Heuglini-type:

Note: P10 looks to be all-dark at the base, but keep in mind that it still has 2 - 3 inches still to grow, and thus may yet show the classic small arc of dark gray on the inner web that is typical of both heuglini and barabensis: