Enchanting Facts About Hedgehogs - Baby Hedgehogs are called "Hoglets" and need their bellies rubbed to aid digestion. | 2. A hedgehog can run over six feet per second. | 3. Hedgehogs are not affected by adder venom. | 4. European hedgehogs hibernate throughout winter. | 5. There are 17 different species of hedgehog. | 6. The most common domesticated hedgehog is the African pygmy hedgehog.