How do I tell males from females?
For ducks, the male is slightly larger with a heavier neck and head. They will also develop a curly feather on their tail. The easiest way to tell them apart is with their voice. Males have a deep, raspy voice. Females have the typical QUACK. For geese, the males walk a bit prouder and strut around a bit more. Their voice is also louder and shriller and they are slightly larger than the females. The only way to know for sure is to vent sex them which is difficult without a bit of training.