In the "sky islands" of the Soutpansberg Mountains of South Africa, two closely related species of primate jostle for space. One is the thick-tailed greater galago (Otolemur crassicaudatus), also known as a bushbaby, which is about the size of a large cat and known for its high-pitched, wailing call. The second primate, the southern lesser galago (Galago moholi), boasts big ears and eyes and is small enough to fit in the palm of your hand.