I rescued a pair of young Khaki Campbell females a few weeks ago. I KNOW they are females because they each give me an egg every morning. Two ducks, two duck eggs. They are very bonded to each other, but one is a bit larger. Recently the big duck started "dominating" the smaller one by pseudo-mating with her occasionally. The ducks live in an ENORMOUS free range yard with trees and grass, a big coop, a kiddie pool, and many, many containers of water---- and 25+ friendly chickens and 2 tolerant roosters. Everyone was getting along famously until today when I saw the larger duck chase down a Speckled Sussex that had the temerity to peck at her ---- then grab her by the neck and "dominate" her repeatedly. The Sussex staggered off, dazed and confused. Is this a temporary thing or are my chickens in danger? Does this aggressive female duck need a drake, or will I make the situation worse? I've never had ducks before, only chickens, so I'm really over my head here!