Lesser Black-backed Gull (graellsii & intermedius)

(last update: May 17 2015)

Lesser Black-backed Gull 4CY, July 18 2013, Katwijk, the Netherlands.

Unringed, hence no provenance about origin, but in all respects nice match to local "Dutch intergrade" Lesser Black-backed Gull breeding at Katwijk.

Bird that has not commenced the complete moult: P1-P10 still present. Black centres on greater primary coverts possible for true adults as well, see known age birds HERE. However, in this individual the greater primary coverts have dark centres and pale tips, typically for immature birds (see 4CY KUAH). This sub-adult has adult-like P5 pattern (sharp blackish band and white tip) and outer primaries therefore it not likely to be in 3CY; added to this the white tail with limited black and large, well demarcated white mirror on P10. Combination of feature typical for 4CY birds.