Drakes and ducks? telling them apart-Ducklings

[HobbyFarmChicks]

Hi we have some 1.5 month old muscovy ducklings. We are selling them and somebody is interested in male ducklings. How do I tell them apart from the females? Please help!

 

[learycow]

Males should be noticably larger than females, though they may be too young still to tell for sure.
If you can post pics of them I can try to help.
But if you look at the legs and necks, males will usually have much thicker legs and necks than the females. And body size will be much larger too.