They usually live in what is deemed as the high forest but can also be found in mangroves, and swamp forests; and has also been shown adaptable to younger forests and even areas that have been cultivated. Their usual groupings consist of around 14-23 other Mangabeys and they feed mostly on fruit and seeds; however they may feed on small animals like invertebrates, and if they are lucky perhaps even an egg or two from a nesting bird.
The Binomial Name of the Collared Mangabey is Cercocebus torquatus, with the Genus being Cercocebus, which has 5 other species of mangabey, of which all but two are endangered, and one of those two is data deficient, meaning it could be endangered once more is known. Cercocebus belongs to the family Cercopithecidae and Superfamily Cercopithecoidea, or Old World Monkeys, which contains two subfamilies. Cercopithecoidea belongs to the Parvorder Catarrhini, which is one of the three main divisions, and is the one you and I belong to as well. From this point on the order is: -> Infraorder Simiiformes -> Suborder Haplorrhini -> Order -> Primates -> Superorder Euarchontoglires -> Infraclass Eutheria -> Class Mammalia.
The Collared Mangabey is currently listed as Vulnerable according to the IUCN, as pressures from hunting and habitat loss have drastically cut down on their numbers. Additionally a disconcerting trend has emerged where even in areas with low hunting pressure it has become uncommon or even missing completely. This means the population trend, meaning their overall population, is decreasing. They are considered a pest by many locals, and are hunted for their meat or to prevent perceived damage to crops. It is likely that they will be listed as endangered in the next decade; however they are not near the dire straits that the Tana River Mangabey is, as this species is critically endangered and is likely to be extinct soon, with only 1,000 or less left alive.
Interesting Facts about the Collared Mangabey: They are related to human beings by being in the same Order, Suborder, Infraorder, and Parvorder.
Picture of the by BS Thurner Hof, licensed under GFDL
The Collared mangabey, red-capped mangabey, sooty mangabey, white-collared mangabey is listed as Near Threatened (LR/nt), is close to qualifying for or is likely to qualify for a threatened category in the near future, on the IUCN Red List of Threatened Species