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Being the largest primate family, the Old World Monkeys now has over 24 genera and over 138 species recognized by humans. Native to Africa and Asia, these monkeys now inhabit numerous environments such as tropical regions, savannas, and both arboreal (‘tree-living’) and terrestrial species are existing. Despite being Omnivorous, the majority of food component of Old World Monkeys are plant- or grain-based.

Most species of Old World monkeys are large in size but there are also small species, such as the talapoin, being the smallest among all with a 34–37 cm length, and 0.7-1.3kg in weight. In contrast the mandrill is about 70 cm in length, and up to 50 kg in weight. The common distinction of Old World Monkeys from New Old Monkeys is the structure of the rhinarium (nose), due to the fact that Primates generally tend to present an evolutionary trend towards a reduced snout. Because of the same reason, it is the arrangement of dentition (teeth shaped differently) that distinct Old World Monkeys form the apes.

Like humans, births from Old World monkeys are usually single and occasionally twins, following a Gestation period from five to seven months, differed by each species. The infants are born relatively well-developed, and lactation can often end around 3-8 months after birth. It takes a while before the monkey grown into sexually matured individuals, with three to six years being typical of most species. In many species, only a single adult male lives or dominate the entire cohort, expelling all rivals, establishing hierarchical relationships between dominant and other individuals. Group sizes are highly variable, even within species, depending on the availability of food and other resources. - https://www.prisysbiotech.com/nhp/what-is-non-human-primate.html