GullDK: Kumlien's Gull (Larus [glaucoides] kumlieni), 4cy, 09.01-05.03.2012, Hanstholm Harbour, Hanstholm

Wednesday, 9 July 2014

Kumlien's Gull (Larus [glaucoides] kumlieni), 4cy, 09.01-05.03.2012, Hanstholm Harbour, Hanstholm

Case: 2012-248
Date: 2012-01-09 -(03-05)
Site: Hanstholm Harbour, Denmark
Observer: Troells Melgaard, Klaus Malling Olsen, Henrik Haaning Nielsen m.fl.

This individual has been identified as Kumlien’s Gulls based on its primary pattern. Note that there is subtle dark shading on the outer webs of the outer four primaries with the colour being darker on the outer than on the inner web. Moreover, the dark shading on P7-P9 reaches the primary tips where the dark colour creates a back-curving hook onto the inner webs which is considered to be a significant kumlieni character. As is often the case with immature Kumlien’s Gulls, the dark colour is often darkest at the very tip of the primaries and also half way out on the outer web. Another very important character is the faint 'ghost mirror' on P10 combined with a dark sub-terminal pattern.

Note that the dark shading on the outer primaries is darker than the shading on the inner primaries and the primary coverts. Additionally, the outer primaries are also darker than the secondaries. The combination of the pseudo-mirror on P10 and dark subterminal spots, dark outer webs on the outer primaries and dark pattern forming a hook onto the inner webs should exclude the brown-winged glaucoides known from West Greenland and Iceland