dark and pale underwing in similarly aged 2cy michs

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Picture ID: 1193
Upload: 07.01.2012
Photo date: 26 July 2008
Location: mamaia
Photographer © cristian mihai
Gallery: michahellis 2cy july-december
Species: larus michahellis

while both birds are at about the same primary moult state: p6 fully grown, p7 ~ 75% of final length, p8 shed, p9-10 old, the dark bird seems to have replaced most of its underwing coverts and axilliaries creating an overall dark appearance while the pale bird seems to be inmidst of the covert moult with many feathers shed.

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