I love your chart! Here's a predator solution that works well for free range chickens...This Northwest Farm Terrier puppy is being trained to protect the chickens. They will herd the chickens to the coop at night, check the sky for Ravens, Hawks and Eagles and drive them off, chase off all manor of chicken predators, including Bobcats, coyotes, mountain lions, raccoons, bears, etc.. These dogs are fearless and take their chicken guarding very seriously. Some training is required.