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Duck with yellow bill.
Thanks, Kibuyu and Fyn.
Mallard is right.
I see that the American black duck would also have the blue in the wing - so I'm still uncertain!
I think the mallard female has the metallic blue feathers in the wings:http://identify.whatbird.com/obj/87/over...
Your bird has a lot of white in tail, which Black Duck wouldn't have.
Lat: 49.32, Long: -123.15
Spotted on Aug 8, 2014 Submitted on Oct 19, 2014