The family Erinaceindae contains hedgehogs and is divided into two sub-families: Erinaceinae, the spiny hedgehogs and Galericinae, the hairy hedgehogs. There are 16 known species of the spiny variety and 8 of the hairy type. Aside from the absence of spines, hairy hedgehogs have longer muzzles and slightly longer legs. The hairy hedgehogs are primarily found in the high wooded areas of Southeast Asia; an area void of the spiny variety. There are no species of hedgehogs native to Australia or the Americas.
Despite their awkward appearance, hedgehogs are versatile. They are able to climb fences and walls with relative ease and speed. With five clawed toes, they are efficient diggers; several species dig nest burrows. Hedgehogs are also competent swimmers; African species found in arid regions without rivers have shown remarkable abilities when crossing water.
As insectivores, hedgehogs feed on beetles, caterpillars, earthworms, and earwigs, but they are not picky in their foraging habits.
The hedgehogs depicted are the Algerian hedgehog, Atelerix algirus, the Southern African hedgehog, Atelerix frontalis and the Ethiopian hedgehog also known as the desert hedgehog, Paraechinus aethiopicus.
