Great Black-backed Gull (Larus marinus)(last update: July 12, 2015) |
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Great Black-backed Gull (Larus marinus) sub-adult, July 30 2014, IJmuiden, the Netherlands.Immature bird (3CY-4CY) in complete moult: P8-P10 old. PMS=26. Active moult in other feather tracts as well, prominent in coverts which are replaced for blackish fresh feathers. Old P10 with small mirror; secondaries with brownish centres and vermiculated along edges. |