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I agree I had looked into this before and read that hawks sometimes change their ranging territories if they are unable to get food at a particular sight for a week or so. I would try keeping them in for about that amount of time and hope the thing changes its route.
Also, this may sound weird to some people, especially if they live in rural areas and battle with crows in order to save their crops, but crows are excellent hawk deterrents. They dive bomb them in flight and call for back up from other crows in other territories when need be. Also, they will let you know when one is around, I have been cued into a hawk or two (and put my girls in) when I heard them cawing. I learned this about three years ago when a neighbor cut down a tree with a crows nest in it, and the crows relocated- it was a breeding pair of American Crows who stood out from the large population of Northwest Crows around here. I didn't see them for two years but I saw more hawks and falcons than I ever had before. I started throwing some scraps out for the crows that wondered into this old crow territory and they came back to the area and I see few prey birds around here. Also, recent research shows that crows actually remember particular human faces as belonging to a friend or foe! So once you make an impression on them, expect it to stick.