Sorry about your duck. We had a hawk get my fave muscovy, Brownie a few weeks ago. It was strange went out side that morning and noticed I had no chickens in the pen. Went to check and all where in the coop and under it. That is when I noticed in the duck pen, Brownie, stuck in the fence picked clean. It took an hour for the chickens to come out of hiding. Chickens seem much more in tune with hawk attacks. My Rooster is always on it warning when something is in the sky. I wish ducks where more leery of the skies.