When are chickens free ranged we could always tell when there was a hawk; all the ladies would end up undercover. We'd look up and there's be a hawk flying over. Now we have them confined and their outside coop has chicken wire over the top.
The neighbor just harvested the wheat field and then the next day someone came in and was baling the stalks for straw I guess. The hawks seem more interested in stuff the farmers are shaking up than the chickens. I'm sure the dogs are a deterent as well.
The hawks are looking for rats, snakes and rabbits. After baling the straw or hay they just lost all of their hiding spots. Usually have a hawk or two follow me around when I am baling hay just for that reason. Have a buddy that says the coyotes will follow him when mowing hay to grab up the rabbits and rats.