I just went and read on: Sexing Ducklings (Please check here first ) to see what a drake feather was. I have a juvenile duck that my drake seemed to be attacking, like he was trying to drown her(?) in the water. It did not look like he was trying to mount her. I read that the hens will have a loud honk and that is one way to tell if it is a hen. I have 4 juveniles and the drake doesn't bother the others. 3 of them look so similar that I can't tell which one is honking from the back. The grey one that the drake attacked was the leader of the young ones but the dynamics of their little clique changed and one of the black ducklings seems to be the leader now and I am pretty sure it is a hen if the honking is true. The grey one used to honk but seems to be silent now. They are about 12 weeks old and I did not know about the drake feather so I am going to go see if I can get close enough to the grey to see the tail feathers.