I brought home these guys over the weekend from an auction and the auctioneer mistakened them for "call ducks". There is a pair of mallards and the other pair are identical in body shape but are black.. Is there some sort of genetic mutation for a black mallard? Here are a few pictures. Not great as they are really flighty. I will be finding them a more suitable home since I am set up for domestic ducks and not these guys. Any help would be appreciated!