Nature Notes

November 19, 2009

Intersex Mallard

Filed under: Morphism,Ontario — Tags: , — Harold Stiver @ 7:00 am

Intersex Mallard

Intersex Mallard

I saw the bird above in the Hamilton harbor area, here in Southern Ontario. It is a wintering area for waterfowl and it is not unusual to see hybrids of Mallard and American Black Duck. However this bird seems to show only Mallard characteristics, although some male and some female.

A little research shows that this is not unknown and that is probably a female Mallard with decreased estrogen.

Joseph Morlan was kind enough to send me some links to information on this.

http://fog.ccsf.edu/~jmorlan/feb00.htm

http://users.utu.fi/hlehto/photo/color/anapla_koirasnaaras.shtml


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