black patch on primary covert

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Picture ID: 496
Upload: 24.06.2010
Photo date: 07 May 2010
Location: murighiol saltlake reserve
Photographer © lou bertalan
Gallery: cachinnans adult alternate (january-june)
Species: larus cachinnans

there seems to be a dark patch on a primary covert - either a younger adult (5cy?) or an unusual retardation. p10 tip seemingly all white.

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