Do all waterfowl accept a mating where 2 or more females can be bred with 1 male ?
No, wood ducks and mandarins pair devotedly, as do most teal, ducks and geese. A couple of notable exceptions are muscovies, which are polygamous, and King Eiders, where 1 drake seems perfectly capable of successfully mating with 3 or more hens. Putting in a second drake usually results in more competing than mating, and unsatisfactory fertility. One really unique pair bond arrangement is that of the Canvasback. In many, but not all, cases a female can be induced to successfully breed by allowing her access to 2 or more male suitors. These frequently finicky females seem to nest more readily if they find just the right mate. Isolating the pair after the female has made her preference obvious usually does the trick.
