I saw a necropsy on an owl done at the animal rescue center in the next National Park North of where I lived in Catalonia. There were 3 rat skulls and the remains of some mice in the owl. One of the disadvantages hawks have is they are daylight hunters and many creatures stay well out of sight in daylight, including predator aware chickens.I would imagine the farmland does provide a lot of available feed for their prey. So an abundance of hawk food is likely here.