Herring Gull (argentatus & argenteus)

(last update: February 11, 2013)

Herring Gull argenteus 1Z sub-adult (5CY), May 2014, Maasvlakte, the Netherlands. Picture: Merijn Loeve.

Blue 1Z, sub-adult 5CY Herring Gull with marked greater primary coverts. P10 mirror merged with white tip. Large mirror on P9, on both webs and thayeri pattern. No black spots on P5, broken band on P6. P1 growing, P2 missing. PMS= 3, 2100000000. Pink legs. Long tongue on P10. Yellow orbital ring, Speckling 0-1%, no black on bill, red on lower mandible, yellow gape.