Hedgehog Facts Did you know? –There are seventeen species of hedgehog in the world. – Despite popular belief there are no hedgehogs native to Australia. -Like many of the first mammals, they have adapted to a nocturnal way of life -Hedgehogs’ spiny protection resembles that of the unrelated porcupines -Hedgehogs are easily recognized by their spines, which are hollow hairs made stiff with keratin. -Their spines are not poisonous or barbed but are still quite pointy (ouch!) –Hedgehogs can roll into a tight ball, causing all of the spines to point outwards as a defensive shield. –Hedgehogs sleep for a large portion of the day under bush, grass, or in dens dug in the ground. -Hedgehogs are fairly vocal and communicate through a combination of grunts, snuffles and/or squeals, depending on species.