As for predators, fox is my worst... but I've also been decimated by dog, coon, and hawk. I find that putting fence posts in random places to clutter up their electronet area keeps the aerial preds out. Of course, YMMV, especially with eagles! But... IMO, birds of prey don't like to fly into an area where they might clip a wing. Depends on how desperate they are. If they are not desperate, they will likely go where the buffet is easier.