Hedgehogs are mammals and have been around for millions of years. These types of animals live through most of Africa and Southern Europe. They are insectivores, but they will eat a variety of different animal food and plants. They are nocturnal and spend the day sleeping and become active at night time. Their biggest trait are their quills. Quills are sharp, hollow hairs that are used as a defense. When they are frightened they curl up into a ball with its quills extended. Their quills are white with brown and they act as camouflage. The African pygmy hedgehog is the most common hedgehog that gets sold for a pet. It grows to around 6-9 inches long. Four to six years is the life span, but some can live up to ten years. Hedgehogs require a large cage even though its small. Some hedgehogs need to be outside of its cage so they can explore and run around.