Just so you don't feel left out guys

I was driving back to the office from a jobsite this morning and saw a pond loaded up with ducks. I wish I could have stayed longer and tryed to get some quality pics but I was in a hurry. I have found mallards, black ducks and a goldeneye in this group. I think there are 2 ruddy ducks(maybe) sitting down behind some mallards. See if you can find and identify them, I would really like to know what the are.