I just put together a fence (for the chicken run) made of the plastic you often see at construction sights. First the hens went under it, so I bought tent pegs and so far that has worked. Then my feistiest hen flew up and over the fence. I think she landed on the top of it first, then jumped over. I had clipped her wings earlier this summer, but apparently it isn't working! So I clipped them again and will see what happens tomorrow. Any ideas?