I do have Aviary netting on the top to keep the hawks from getting them... I do understand that it would not work for everyone but it does work for me.
Can you tell us what kind of aviary netting you used and where you got it? I'm looking at covering multiple runs now. Here in NC, I'm hoping I don't have to worry so much about snow & ice (well,we will see how the netting will hold up to ice)...