My ducks are now 7 weeks old and I still don't know what sex they are. They are mallards. I have 4. At first I thought I had 1 male and 3 hens because one of their bills was yellowish while the others were dark. But then one of the other ones is forming a white ring around its neck. And I was told that males have a white ring around their necks. And that's the only one with one and that's not the one with the yellow bill. Also, one of the ducks is quacking while all the rest are still peeing. I don't know which one is quacking because they are always all together. So I know I have at least one female but I don't know which one. I hope 3 of them aren't drakes but I have no idea. Someone, please help!