I bought a mix assortment of ducklings early this summer. Ended up with 5 Cayuga 2 Rouen hens a blue Swedish hen and not sure on the last one. My question is if I get a Rouen Drake would the 2 Rouen hens mate souly with him as well as the Cayuga? The all stick together in the same flock(with my 2 Geese as well) but seems as if they separate by breed. The blue Swedish leading the 2 Rouen right behind her the Cayuga in the middle and the Geese in the rear.