I need help with my Muscovy Ducks. I have 4 ducks are almost 3 months old (I think, they are growing in all their adult feathers and getting their wing feathers.) I bought them at an auction so I have no clue what sex they are. The one is a very big duck, one is very small. I know those two are a male and female. The other two are both a medium size. They all still do little chirps yet. What are some ways to know whether the two medium ducks are male or female. Could they be from a different clutch because the one medium duck was the smallest when I bought them. I'm also knew to this site so tips would be appreciated. Thanks.