Lesser Black-backed Gull (graellsii & intermedius)

(last update: May 17 2015)

Lesser Black-backed Gull sub-adult, April 30 2014, Katwijk, the Netherlands.

Probably 4CY bird, be retarded 5CY bird hard to exclude. Note adult-like pattern on most secondaries and adult-like central primaries and mirror on P10. Typical sub-adult pattern on greater primary coverts, many brown coverts and dark centres on several secondaries.