Adult Herring Gull Green YCAV with advanced primary moult – 20160520

While color-ringing adult European Herring Gulls in the colony of IJmuiden, we caught this female showing some interesting wing moult.

Primaries P1 and P2 were already half-grown whereas most adult Herring Gulls at this time of year have either just started dropping these primaries or have yet to start their moult.

G-YCAV-20160520-3

G-YCAV-20160520-1

We took a moment to have a closeup look at these incoming primaries and it was interesting to see the new feathers emerging from their pins.

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IJmuiden (Forteiland), the Netherlands, 20 May 2016.

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