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  1. W

    Mallard with a blue/grey bill

    Perhaps a better angle of his coloration might help solve the mystery.
  2. W

    Mallard with a blue/grey bill

    After scouring the internet I believe that it could be a) carotenoids issue or b) a hybrid with a Lesser Scaup. I am still trying to find a difinitive answeer to my question though. Haha
  3. W

    Mallard with a blue/grey bill

    New to the bird forum but a long time birder. Today I came across a fascinating Mallard. This Mallard had a bluish-grey bill; you can notice on the image that there is some faint yellow at the base of the bill. What I am wondering is if this a form of carotenoid issue or Leucism? or simply...
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