Rusty-mantled Mangabey

Osman Hill's mangabey is a medium-sized lanky, arboreal, dark furred monkey. The sexes are similar in colour and markings but males are far larger than females, the size difference being especially marked in this subspecies compared to the other subspecies of the grey-cheeked mangabey. They have long, loose fur which is mainly blackish-brown, and a rufous tinged mane of longer hairs over the shoulders which is more noticeable in the males. The head shows a tuft on the crown and smaller tuft above the eyes, although these may not always be present, the cheeks are pale. The long tail is frequently held arched over the monkey's back. The two ischial callosities are bare and for a "C" shapes which are complete in the male but often broken in the females. The bare skin on such places as the palms and soles is pink in newborns but darkens as the get older and is normally black by nine months of age. A single male specimen has been measured and he had a head and body length of 610mm and a tail length of 920mm.

Osman Hill's mangabey has a very small range from the Cross River in south eastern Nigeria to the Batouri district of south eastern Cameroon.

Osman Hill's mangabey was named after William Charles Osman Hill, a primatologist, anthropologist, and anatomist from the 20th century.

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