Yes, I know that ducks don't always stick with their same breed for mating, but do they tend to stick with the same type? I have Khaki Campbell drakes & hens, and also 2 Pekin hens. The KC drakes never mate with the Pekins. Could that be because the Pekins are so tubby & the KC drakes less so? If I added a Pekin drake might he mate with the KC hens? I plan to get some Indian Runners this summer, 1 drake + 4 hens. Do you think the IRs will mate with the KCs? With the Pekins? Runners have such a distinct body type I wonder if they would be attracted to, or attempt to mate with other kinds of ducks. It only matters because I sometimes sell the eggs for hatching, & I'd like to keep the breeds separate. Or do I need to? I like the mixed-breed chickens we get, are mixed-breed ducks just as nice?