My Ameracauna rooster Steve loves to fly up over my six foot high pen in order to terrorize Bob, the handsome new SL Wyandotte cockerel (little does Steve know that Bob will soon outweigh him in the extreme). What do you all use specifically to cover your runs and prevent flying predators, hawklike and otherwise? Is there a mesh-like screen that you suggest? I'd like not to have to someday dub my Wyandotte guy "One-eyed Bob" due to Steve's jealousy.