In North America, one of the most common wild hybrids results from mallard/pintail breeding. Mallards also commonly crossbreed with black ducks, wigeon, shovelers, cinnamon teal, green-winged teal, and gadwalls. Wood ducks also will cross breed with a number of other species. Snow geese will cross with Specks, a real weird looking one. I have seen maybe a dozen cross breeds in total, maybe a few more that at the time I did not realize were crosses. Sometimes with juvenile birds it is not that easy to tell. Love know few limits for a mallard. They will jump everything including a traffic cone given a chance.
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