Today at West Pond along the Clearwater River in Lewiston, Idaho we had this interesting duck.
https://www.flickr.com/photos/birddog/22560453773/in/dateposted-public/
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https://www.flickr.com/photos/birddog/22819563499/in/dateposted-public/
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It appears to be the same bird we observed in January 2015 in the same location.
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At that time there was a?discussion about hybrid or intersex Mallard and Dave Appleton of the UK provided this interesting reference.
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http://birdhybrids.blogspot.co.uk/2015/01/intersex-birds-and-their-confusion-with.html

Whatever he or she is, the bird is certainly interesting.
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Keith E. Carlson
Lewiston