Gulls in NW Europe
(last update: September 25, 2011
Herring Gull adult, January 16 2013, Katwijk, the Netherlands.
Image to show wing-tip variation in adults.
Mirror on P10 may be separated from tip (full sub-terminal band); may be connected to the tip by a broken band at the centre; or may be merged completely with the white tip.
Mirror on P9 may be absent; may be restricted to inner-web; or may bleed into outer-web.
Sub-terminal black on P5 may be absent; may be a single mark on the outer-web; may show a diffuse band; or may be an obvious complete black band.
