Gulls in NW Europe

(last update: September 25, 2011 )

Herring Gull sub-adult, January 23 2013, Katwijk, the Netherlands.

4CY and 3CY sometimes much alike when inner primaries show brown cast. Last acquired inner secondaries typically adult-like patterned, as often found in 4CY birds. But maybe best aged "sub-adult".