Magpie Duck
...that the bill of the Magpie Duck becomes green as the bird gets older, and its black crown may go completely white?
...that the bill of the <b id="mwA0o"><a class="mw-redirect" href="./Magpie_Duck" id="mwA0s" rel="mw:WikiLink" title="Magpie Duck">Magpie Duck</a></b> <i id="mwA0w">(pictured)</i> becomes green as the bird gets older, and its black crown may go completely white?