Hi! I got two unsexed ducks about 9 months ago and one of them is obviously a boy. He is massive, has a curly drake feather, and is slightly aggressive. My other duck however, is smaller and we always assumed that it was a girl. Then one day we saw a little curly tail feather on her. Having seen no eggs thus far, it made sense that she was really a boy. Now, the curly feather that was once on her tail is gone. Is that normal? It was very clearly curled one day and then the next it was flat.