hi, I am thinking to get 2 female ducks, probably khaki campbell or white layer if I find them. if not then muscovy ducks. I prefer to get the younger ones but I need to know how to be sure they are females. another question is: will they be ok with chicken? they will be on the ground of the coop and chicken are on the different level of the coop (a kind of the 1st floor) but the common run. can they help in numbering females per rooster (I mean can I have 2 hens less per rooster)?