I have three female Welsh Harlequin ducks and four chickens at the present that are together all the time, except at night. Am wanting to get a pair of Black Swedish Ducks in the spring and want to know if I have to keep them separated from the chickens? I believe I saw on BYC that a male duck will try to mate with a chicken and it will kill the chicken. Is that correct? If I have to keep them separate I guess I'll need to build them their own house and run???? Any help here would be appreciated. Thanks.