Hedgehogs are small omnivores, body weight rarely exceeds a kilogram, mammals. Instead of hair, the upper body of hedgehogs is covered with a strong, needle-like shell. The head and belly are protected by coarse, rather stiff fur. The length of the hedgehog needles does not exceed three centimeters, the needles are smooth, empty from the inside. Hedgehogs are active at twilight or at night, and hibernate for the winter.