Early this spring I purchased 5 ducklings.... 4 of which were runners and 1 was a Rouen. That one was definitely a female. So I had the 4 runners.... 1 of which developed all the drake signs.... whisper voice, drake feathers, yadda yadda... he even tried to mate with the turkeys that he was raised with... LOL The other 3 appeared to be females..... loud quacks, no drake feathering.... all 3 had the same slim necks and lines in comparison to my drake.... and I've been getting a TON of duck eggs! If I didn't know any better I'd swear they were all laying at least 2 eggs a day! LOL They tend to drop eggs wherever they are so it's impossible for me to know who is laying what for sure, but I know at least 2 are females for SURE as I get tan eggs and blueish eggs from them. Earlier this summer I was baffled when I saw one of the girls mount the other and mate But didn't see any further male behavior from her.... and even saw her mated by the drake??? So thought maybe it was just dominant behavior???? Still the same slender loud female acting duck. But, I lost my drake a week ago....... now my girl in question is mating the other girls again and looks to be growing a curly tail feather????? Soooooooooooo........ Is my girl having hormonal issues???? Or would a drake in a flock with a severely over sexed male 'hide' the fact that he was a male until given a chance to assume the lead role? Or is it just a slow maturing male? It's around 6 months of age.