I have 3 Cayuga ducklings that are 7 weeks old. I also have 3 Muscovy ducklings the same age. It has become very apparent that 2 of the 3 Muscovy ducklings are male (very large feet, legs, body compared to 3rd duckling). With these three they are basically identical to me. They don't quack loud, they don't quack softly, it is somewhere in between. All three seem to have very similar builds, leg size, and feet. I believe they are most likely the same gender....whatever that is. Any opinions?