Chickens do eat mice. Is a chicken a meat eater? Rodents are part of these bird's diet. Chickens, like hawks and predatory birds, eat meat. Chickens will eat other chickens if the opportunity presents itself. This is a problem in captivity. When chickens see bloody raw meat, they devour it. Throw a picked rotisserie carcass to your chickens when you are done with it and they will pick the meat to the bone. They also will eat seedy fruits like canalop and watermelon. Chickens eating mice are a benefit as mice do carry tics and other diseases that can be harmful to your pets and farm animals. Sure, a baby mouse is cute, but when they contaminate your expensive bags of horse feed, you may be happy to feed mouse meat to your chickens to eat.