Wigeon with yellow head

I never noticed before, but some males here have a yellowish crown, which I thought was supposed to be white. Is it a seasonal thing? Is it just schmutz that’ll wash off?

23 October 2021

  • Camera: ILCE-7M3
  • Aperture: f/5.6
  • Focal length: 300mm
  • ISO: 1000
  • Shutter: 1/350 s

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