I have 6 Pekin ducks (4 females and 2 males) and 2 female Khaki Campbell ducks. My concern is that I was given two ducklings that are now about 8 weeks old and they appear to be 2 female call ducks. Can these two little ducks co-exist with my other ducks and survive???? Thank you!!! I have 30 acres.....a one acre pond that is 13-15 deep for them to free-range all summer. For the winter, I corral them in a one acre, electric-fenced orchard with an 8'X10' or 10'x12' building that is insulated with hay and has water and feed inside for them. I 'tuck' them in nightly and every morning I give them new drinking water and fill two children's pools to swim and bathe in. I am just concerned about the size difference of my pekin drakes and the female calls.....advice is welcomed!!!!!