Last night when I got home from work, I found a hawk trying to break through the chicken wire of my run- with his talons! He must have caught my Silkies unawares, because one has a (luckily) minor cut on its head. They must have been up against the edge of the run. I know you can create a web across a flight path to deter hawks, but they were already in their run so we're talking about having to cover a significant backyard area. Anyone have any suggestions on other (hopefully less massive) preventative measures?