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olive colobus
The olive colobus monkey (''Procolobus verus''), also known as the green colobus or Van Beneden's colobus, is a species of primate in the Cercopithecidae family. Its English name refers to its dull olive upperparts.〔Kingdon, J. (1997). The Kingdon Guide to African Mammals. Academic Press Limited, London. ISBN 0-12-408355-2.〕 It is the smallest example of all colobine monkeys and is rarely observed in its natural habitat because of its cryptic coloration and secretive nature.〔Oates, J.F.(1988). "The Diet of the Olive Colobus Monkey, Procolobus verus, in Sierra Leone." ''International Journal of Primatology'',9(5),457-478.〕 It is found in the rain forests of West Africa, ranging from southern Sierra Leone to Nigeria.〔Oates, J.F.,Gippoliti, S. & Groves, C.P. 2008. ''Procolobus verus''. In: IUCN 2011. IUCN Red List of Threatened Species. Version 2011.2.
. Downloaded on 8 December 2011.〕 The olive colobus is classified as near threatened by the IUCN Red List, the cause of its decline attributed to habitat loss and hunting.〔 Though much of the land within the range of the olive colobus has been affected by human activities, it retains its ability to thrive in small degraded forest fragments.〔
==Description==
''Procolobus verus'' is a small-bodied mammal with an average body weight of 4.6 kilograms for males and 4.1 kilograms for females.〔 The olive colobus are greenish-brown in color with the hairs transitioning from greenish-yellow at the root, and becoming darker towards the tip.〔Osman Hill, W.C. (1952). "The External and Visceral Anatomy of the Olive Colobus Monkey (Procolobus verus)." ''Proceedings of the Zoological Society of London'', 122 (1), 127-186.〕 The under side of the olive colobus is lighter in color and the hairs found on the face are stiff and dark.〔 Their coloration allows them to stay camouflaged within the trees reducing the risk of predation. These monkeys have a unique feature in that their thumb is severely reduced on their forefeet, while the hind feet retain five digits.〔 The feet of the olive colobus are also abnormally large compared to other African colobine species.〔McGraw, W.S., & Zuberbühler, K. The Monkeys of the Taï Forest: an Introduction. McGraw, W.S., Zuberbühler, K., & Nöe, R. (Eds.) (2007). Monkeys of the Taï Forest: an African Primate Community. Cambridge University Press.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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