I have 7 hens that range from a giant cochin to a tiny bantam frizzle. Today I walked outside to see a hawk, which I later researched and realized it was a Cooper's Hawk, sitting on my fence. The chickens free range the yard all day and were on the other side of the yard at the time. I shooed him off and hung out with the chickens for a bit, not thinking he was really a threat. But he kept showing up and for safety I put the chickens back in their run when I went inside. They're not thrilled with being stuck in the run, but I wanted to get some insight on how to get rid of this hawk - still hanging out in the yard and not too concerned with me. He just changes position on the fence when I get too close, almost lazily. How concerned should I be about my chickens? They are very loved pets so I want them to be safe, but happy as well and able to roam the yard.