Fisher cats are the top of most food chains. They eat rabbits, frogs, mice, squirrels, voles, deer, and many other small and medium sized animals. First of all,fishercats are not cats. They are known to attack smaller mammals,(dont lets your pets out at night if one is living near you) The noise they make sounds like a screaming woman...its creepy They eat mainly fish, frogs and crayfish, though they will also hunt rodents and birds.