Ok, last year I was very successful in being able to accurately tell what sex the muscovy were between 4-6 weeks of age. I am having a tough time with this group. They are just over 4 weeks old and a couple are obviously male. But the rest I'm just not sure of. I have buyers waiting for as soon as I can tell. Any guesses are appreciated. I am very positive that the black one is male, and am hoping the brown in the pics are female.