The Okapi's natural home is the rainforest of the Congo Basin in Central Africa. Once (erroneously) thought to be a forest species of zebra, its closest relative is actually the Giraffe (Giraffa camelopardus), which tend to inhabit more open country such as savannah (grasslands), although both species are browsers (leaf-eaters), possessing a long, dark blue tongue, as well as horn-like growth called "ossicorns" on top of their heads.