3cy Herring Gull / Larus argentatus, Barneveld - Landfill (The Netherlands) on 28 January 2011
Ringcode: T31958, there is no ring data of this bird. Pictures of a contrastingly patterned argentatus from Estland. Note the missing p1 in the left wing. A few inner greater coverts and upper tertials are recently replaced by new third generation feathers. The tail is complete moulted to second generation. The new scapulars are not plain adult-like grey as in most argenteus, but the scapulars are moulted to third generation feathers which strongly resemble the second generation feathers. Consequently, 3cy argentatus may look very delayed in their moult, compared to argenteus in mixed groups and they can sometimes be mistaken for 2cy birds. The bill is immature pink colored with a broad black band on the gonys which a bit reminiscent to the bill pattern shown by Glaucous Gulls.
From: Ies Meulmeester, Tuesday 5 April 2011, 19:11