I thankfully havent had an problems with hawks yet. Which is amazing since there is actually a nest sitting right above my covered duck pen, and another about 200 yards away. I think its probally due to the fact there there are at least fifty little birds at the bottom of my yard eating from my compost pile. I have walked outside to see hawks watching my ducks a couple of times. I think the other reson is that I only have 2 ducks at the moment. I have a muscovy male and female, my drake is 2 .5 years old and tipping the scale at 16 pounds so he is a very big duck. My female is still very small, she is only 4 months old and she is like my drakes shadow. There has only been one time that I have seen her more than a couple feet away. While I have not had any problelms yet, the day I do is the day the hawks in my yard die regarless of what the law says.