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The Collaborative International Dictionary
Diana monkey

Diana \Di*a"na\, n. [L. Diana.] (Myth.) The daughter of Jupiter and Latona; a virgin goddess who presided over hunting, chastity, and marriage; -- identified with the Greek goddess Artemis.

And chaste Diana haunts the forest shade.
--Pope.

Diana monkey (Zo["o]l.), a handsome, white-bearded monkey of West Africa ( Cercopithecus Diana). [1913 Webster] ||

Wiktionary
diana monkey

n. ''Cercopithecus diana'', an Old World monkey found in West Africa.

Wikipedia
Diana monkey

The Diana monkey (Cercopithecus diana) is an Old World monkey found in West Africa, from Sierra Leone to Côte d'Ivoire.

The Diana monkey ranges from 40 to 55 cm in length, excluding its tail, which is of a uniform 3–4 cm diameter and 50–75 cm long. Adults weigh between 4–7 kg. Individual Diana monkeys may live for up to 20 years.

They are generally black or dark grey, but have a white throat, crescent-shaped browband, ruff and beard; the browband gave the species its common name, since it was held to resemble the bow of the goddess Diana. The monkeys' underarms are also white, and they have a white stripe down their thighs, while the backs of their thighs, and their lower backs, are a chestnut colour. Apart from the browband, ruff and beard, and some fringes on their limbs, their fur is short and sleek in appearance.

Like most primates, Diana monkeys can always carry diseases that can be communicated to humans, like yellow fever and tuberculosis, but they are not important carriers of these. The species is regarded as vulnerable by the IUCN as well as by the United States Fish and Wildlife Service, the chief dangers to them being habitat destruction (they are now virtually confined to coastal areas) and hunting for bushmeat.

Two taxa formerly considered subspecies of the Diana monkey have recently been elevated to full species status: the roloway monkey (C. roloway) is found in Côte d'Ivoire and Ghana, and the Dryas monkey (C. dryas) found in the DR Congo.