How many baby Hamlyn’s monkeys are in a litter?
A Hamlyn’s monkey (Cercopithecus hamlyni) usually gives birth to around 1 babies.
Upon birth, they weight 468 grams (1.03 lbs) and measure 2.9 cm (0′ 2″). They are a member of the Cercopithecidae family (genus: Cercopithecus). An adult Hamlyn’s monkey grows up to a size of 28 cm (1′ 0″).
To have a reference: Humans obviously usually have a litter size of one ;). Their babies are in the womb of their mother for 280 days (40 weeks) and reach an average size of 1.65m (5′ 5″). They weight in at 62 kg (137 lbs), which is obviously highly individual, and reach an average age of 75 years.
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.
Other animals of the family Cercopithecidae
Hamlyn’s monkey is a member of the Cercopithecidae, as are these animals:
- Drill (animal) with 1 babies per pregnancy
- White-fronted surili weighting around 6.12 kilograms (13.49 lbs)
- Purple-faced langur with 1 babies per pregnancy
- Tana River mangabey with 1 babies per pregnancy
- Javan surili with 1 babies per pregnancy
- Zanzibar red colobus with 1 babies per pregnancy
- Dent’s mona monkey with 1 babies per pregnancy
- Mentawai langur with 1 babies per pregnancy
- Campbell’s mona monkey with 1 babies per pregnancy
- Phayre’s leaf monkey with 1 babies per pregnancy
Animals that share a litter size with Hamlyn’s monkey
Those animals also give birth to 1 babies at once:
- Long-footed water rat
- Eastern bettong
- Davis’s round-eared bat
- Blyth’s vole
- Daubenton’s bat
- Black-rumped agouti
- Hispaniolan solenodon
- Western rock elephant shrew
- Sei whale
- Grévy’s zebra
Animals that get as old as a Hamlyn’s monkey
Other animals that usually reach the age of 13.5 years:
- Whiptail wallaby with 14 years
- Smooth-coated otter with 15 years
- Southern needle-clawed bushbaby with 15 years
- Sable with 15 years
- Red brocket with 13.75 years
- Mountain nyala with 11 years
- Hirola with 15.17 years
- Grant’s gazelle with 12.67 years
- Black-footed mongoose with 15.83 years
- Cave myotis with 11.25 years
Animals with the same weight as a Hamlyn’s monkey
What other animals weight around 2.31 kg (5.09 lbs)?
- Southern tree hyrax usually reaching 2.71 kgs (5.97 lbs)
- Kinkajou usually reaching 2.45 kgs (5.4 lbs)
- Japanese hare usually reaching 2.53 kgs (5.58 lbs)
- Kodkod usually reaching 2.5 kgs (5.51 lbs)
- Central American agouti usually reaching 2.31 kgs (5.09 lbs)
- Rock-haunting ringtail possum usually reaching 1.88 kgs (4.14 lbs)
- Stripe-necked mongoose usually reaching 2.38 kgs (5.25 lbs)
- Dusky pademelon usually reaching 2.74 kgs (6.04 lbs)
- Striped skunk usually reaching 2.4 kgs (5.29 lbs)
- Angolan genet usually reaching 1.86 kgs (4.1 lbs)
Animals with the same size as a Hamlyn’s monkey
Also reaching around 28 cm (1′ 0″) in size do these animals:
- Southern needle-clawed bushbaby gets as big as 30 cm (1′ 0″)
- Lutrine opossum gets as big as 32.4 cm (1′ 1″)
- Brush rabbit gets as big as 30.4 cm (1′ 0″)
- San José brush rabbit gets as big as 29.4 cm (1′ 0″)
- Striped possum gets as big as 25.5 cm (0′ 11″)
- Giant golden mole gets as big as 23.4 cm (0′ 10″)
- Hooded skunk gets as big as 30.8 cm (1′ 1″)
- White-tailed antsangy gets as big as 22.5 cm (0′ 9″)
- Striped polecat gets as big as 33.5 cm (1′ 2″)
- Derby’s woolly opossum gets as big as 23.1 cm (0′ 10″)