Animal Size

Hamlyn’s monkey size: How big do they get?

How big does a Hamlyn’s monkey get? Here is an overview over the average adult age:

A grown Hamlyn’s monkey (Cercopithecus hamlyni) reaches an average size of 28 cm (1′ 0″).

When born, they have an average size of 0 cm (0′ 0″). Usually, they reach an age of 13.5 years. A full-grown exemplary reaches roughly 2.31 kg (5.09 lbs). A Hamlyn’s monkey has 1 babies at once. The Hamlyn’s monkey (genus: Cercopithecus) is a member of the family Cercopithecidae.

As a reference: Humans reach an average body size of 1.65m (5′ 5″) while carrying 62 kg (137 lbs). A human woman is pregnant for 280 days (40 weeks) and on average become 75 years old.

The average adult size of a Hamlyn's monkey is  (1' 0

The Hamlyn’s monkey (Cercopithecus hamlyni), also known as the owl-faced monkey, is a species of Old World monkey that inhabits the bamboo and primary rainforests of the Congo. This species is exceedingly rare and known only from a few specimens; little is known about it. However these specimens tend to be widely dispersed throughout the eastern part of Congo, from the Epulu River to the Lukuga River and from the Congo River to the Kabale Forest, with one example in northwestern Rwanda. Geographically it corresponds quite closely to another species of monkey, L’Hoest’s monkey C. lhoesti. It travels on the ground, and researchers think that it may be awake primarily by night.Schwarz (1928) grouped this species with C. l’hoesti, while Elliot (1913) noted its distinctive cusp pattern on the third molar, and reassigned it to a separate genus, Rhinostigma. This he believed to be an intermediate between Cercopithecus and Cercocebus. Hamlyn’s monkey has one subspecies other than the nominate. In weight, the male is much larger than the female, with the average adult weighing 7 to 10 kg, while females weigh on average 4.5 to 6 kg. It is thought to be a frugivore-folivore in diet. Some published reports indicated that Hamlyn’s Monkey lives in small groups, of ten members or less, with one male and multiple females, with no data to show them occurring in monogamous groups. The species has been found only in higher elevations, above 900m and up to 4600m. In color it is generally dark gray, with a characteristic white stripe which extends from the root of the nose to the upper lip, giving it an owl-like appearance, hence the name “owl-faced monkey”. The name “Hamlyn’s monkey” and the scientific epithet “hamlyni” come from the animal dealer who first brought this species to the London Zoo. It has scent glands on its chest with which it marks its territory. Both sexes have bare, blue buttocks, and the mature male has bright red and blue genitals. The juvenile coloration is a yellow-brown coat and a pink face. In captivity it has been known to live for about 33 years. Like others of this genus, it covers a wide area in its daily travels, mostly in a search for food.

Animals of the same family as a Hamlyn’s monkey

We found other animals of the Cercopithecidae family:

Animals with the same size as a Hamlyn’s monkey

Not that size really matters, but it makes things comparable. So here are a couple of animals that are as big as Hamlyn’s monkey:

Animals with the same litter size as a Hamlyn’s monkey

Here is a list of animals that have the same number of babies per litter (1) as a Hamlyn’s monkey:

Animals with the same life expectancy as a Hamlyn’s monkey

Completely different animals, but becoming as old as a Hamlyn’s monkey:

Animals with the same weight as a Hamlyn’s monkey

As a comparison, here are some other animals that weight as much as the Cercopithecus hamlyni: