The Knucker is another species of dragon that can found in Western Europe. The Knucker can grow up to 30 feet long by 3 to 6 feet high and is serpentine in appearance and like some serpents; it kills by injecting venom in to its victim. The Knucker has two vestigial wings, but cannot fly.
Knuckers can be found in damp woodland locations and make their homes in deep ponds or wells. You can imagine the horror of going out to your well and seeing a Knucker slithering up and out of your well.