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Two species of Black-and-white Colobus monkeys are found in Kenya, those that inhabit coastal forests : the Angola colobus (Colobus angolensis) and those in inland high-country areas : the Guereza or the Eastern Black-and-white Colobus (Colobus guereza). The name “colobus” is derived from the Greek word for “mutilated,” because unlike other monkeys, colobus monkeys do not have thumbs. Their beautiful black fur strongly contrasts with the long white mantle, whiskers, bushy tail, and beard around the face. The Eastern black-and-white is distinguishable by a U-shaped cape of white hair running from the shoulders to lower back, whereas the Angolan black-and-white has white hairs flaring out only at the shoulders.

The Angola colobus (Colobus angolensis), Angolan black-and-white colobus or Angolan colobus, is a primate species of Old World monkey belonging to the genus Colobus. 

The Angola colobus occurs in dense rainforests, both in the lowlands and coastal mountains. It lives in most of the Congo Basin, to the south and northeast of the Congo River, as far as Ruwenzori, Burundi and southwestern Uganda. The species can also be found in East Africa, especially in the montane and coastal forests of Kenya and Tanzania and in isolated mountain areas. Although the species is named after Angola, it is quite rare in that country. Of all Colobus species, the Angola colobus occurs in the southernmost latitudes. The geographical range lies south of that of the mantled guereza. It is found up to 2,415 m above sea level in Kenya. In Kenya they can be seen easily in Diani beach.

Source : Wikipedia