I live on the NC /SC state line.
Edited by Sfraker - 11/14/14 at 1:48pm
Looks like a Coopers hawk to me, and yes it would give your ducks and guineas a try. Well done on the netting over the pen.
Quite visible in the picture if you enlarge it - that plus conformation led me to believe that it is most likely a Coopers hawk.