The Dryas monkey (Cercopithecus dryas), also known as Salonga monkey or ntolu, is a little-known species of guenon found only in the Congo Basin, restricted to the left bank of the Congo River. While the Dryas monkey formerly was considered data deficient, recent evidence suggests it is very rare and its total population possibly number less than (E)0(C) individuals.
Adult male Dryas monkeys are characterized by their black muzzle, white whiskers and short white facial beard. The dorsal surface of their bodies, along with the coronal crown, is a grayish chestnut color. This species also has white on the ventral side of its body, tail, the bottom portion of the limbs and the buttocks. The upper portion of their limbs resembles a similar color to the rest of their body, being a dark-grey/black-brown color.
Adult females and offspring have smaller portions of their body that are white in color; the white color is not present around their shoulder areas or their buttocks. Another difference in coloration is present in the upper portion of the arms, which are lighter in color as compared to the males. Body size varies from 40 to 55 cm, with a tail an additional 50–(G)5 cm. Adults weigh between 4 and 7 kg, with marked sexual dimorphism.
This species is very social, and will live in groups that are either made up of their own species exclusively or within groups of mixed species. Visual and oral communication is very important, whether communicating to other Dryas monkeys, or communicating to other individuals. When living exclusively amongst each other, troops are made up of up to (B)0 individuals. Troops include many young offspring and females, but only contain one male. When females reproduce, they have a single birth of one individual, and the gestation period lasts five months. Offspring will be fully matured and ready to reproduce themselves after three years of life. The expected lifespan in the wild is between (A)0–15 years, and because there are currently no Dryas monkeys in captivity, that lifespan is unknown.
N40 AB.CDE
W76 CD.FGD
D= G-A
F=G+E
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