I just got some exotics in the last 1.5 years. (had domestics for over 15). I got a pair of silver pochards; they were in a temp pen. While we built a larger aviary. I saw the female pecking at the male rather often. Which I thought was odd. One day, he got caught in a piece of wire and it was just one spot on his wing. He died 2 days later (I did some first aid,but it really didn't look like anything but a scratch). FF I got a pair of red head pochards, some Austrialians and Fulvous Whistling ducks. They were in the large aviary...did see her peck at the red head male a few times (no blood, just like she was chasing him off) (both pairs were supposed to be a young mating pair.)...One day I found him dead, not a mark on him... Ok bad luck? I have also seen her chase the other ducks off when I put food in the two feeders.. The Austrialians can fly some so she can't go after them. Then I found my male Fulvous dead in the little pool, no marks on him... don't think she did it, because they can fly too...more 'bad luck' I guess... But I have seen her picking on the other female red head a bit lately... and the female Austrialian, but they can fly, and are quicker and she is fat and doesn't fly.... my gut feeling is she is too aggressive maybe because she is a hybrid and I am planning on separating her ...and I am not sure I want to buy her another mate if she is 'a bully'.... and replace the other 2 males... thoughts?