You could also string some CD discs across the fenced area, birds hate the shiny reflection. 

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Just had an awful scare! A hawk of some sort was perched atop my chicken run! I wish I knew my types of hawks, but I don't. I had almost let the chooks out early, but it's Sunday morning, and I was afraid the rooster would annoy the neighbors sleeping in. Thank God I did not. I'm sure that hawk would have gotten the Bantie. I've never seen a hawk here before. I'm in the city. Do you think he'll likely be back, or was he just passing over? Something new and horrible to worry about! Do you think the hawk could have smelled the chickens, and that was why he was atop their run? It is not roofed. Do you think it is safe to leave the chickens outside while I go to church? It's to be 95 F today. Should I leave them in the coop?
The rooster had been crowing. The hawk could have heard the rooster? Thanks for the good info!
Interesting, Nambroth. We are off to get netting now. I wonder where I can find a cheap owl decoy? Anyone know who has them for sale cheap?