1cy Yellow-legged Gull / Larus michahellis, Westkapelle - sea dike (The Netherlands) on 19 July 2007
Large and bulky build bird. The (inner) greater coverts are well patterned. The coverts and scapulars show broad creamish fringes. In the post-juvenile moult a few scapulars and some lesser, median and two inner greater coverts are dropped.
From: Ies Meulmeester, Thursday 18 February 2010, 21:01
Note the typical pale primary window which is create by a pale inner web and a dark outer web of the inner 5 primaries.