I have 7 young Embdens, around 12-14 weeks old right now. What is the best way to identify their sexes, when do those differences begin to show? I got their parents when they were about 6 months old, I think I remember that it was apparant which was the goose & which the gander. I think I remember that the gander was bigger & had a thicker neck by then. Is there a good way to tell before that age? I'd like to keep one goose & one gander from this batch of goslings, and sell the others soon. I'd like to be able to tell buyers the sex of their purchases, and to be sure to have a pair to keep.