I have two pekin wild mallard cross drakes and want to get some females for them. Is there an easy way to tell somewhat acurately if they are a boy or girl while ducklings? I am looking at getting mallards. We have experianced what is like to have to many guys to girls and don't want more males if we can help it. I was thinking of getting 4 females to ward off the girl hogging. Thanks for any help.