Description: Tana River Mangabey, (Cercocebus galeritus galeritus), Kenya, Eastern Arc Mountains and Coastal Forests of Tanzania & Kenya, The Tana River Mangabey is found only in a 37-mile stretch of forest on both sides of the lower Tana River. A 30 percent loss of original vegetation over the last decade threatens their existence. Credit: Julie Wieczkowski Copyright: Julie Wieczkowski/University of Georgia Source:  Conservation International