Fogie I'm sorry but Oldtimr is right. You absolutely need to know how to identify the waterfowl species you shoot. And resulting in making rude comments is no way to act in a forum. My advice is go in the off season and just watch the ducks and learn and watch videos on the subject. You should be able to easily identify coots, merganzers, teal, woodies, mallards, pintails and the rest. If you can't you have no business in a blind. The Federal Wildlife has no leniency when it comes to shooting illegal game or going over your limit.
And if you won't eat it don't shoot it. Or at least cook it for your dog. Maybe he'll eat it..