Green Pygmy Goose
... that the female Green Pygmy Goose has a lower pitched whistle than the male?
... that the female <b id="mwAuQ"><a class="mw-redirect" href="./Green_Pygmy_Goose" id="mwAuU" rel="mw:WikiLink" title="Green Pygmy Goose">Green Pygmy Goose</a></b> has a lower pitched whistle than the male?