It is hard to guess what a Spix’s night monkey weights. But we have the answer:
An adult Spix’s night monkey (Aotus vociferans) on average weights 873 grams (1.92 lbs).
The Spix’s night monkey is from the family Cebidae (genus: Aotus). When reaching adult age, they grow up to 35.8 cm (1′ 3″). Usually, Spix’s night monkeys have 1 babies per litter.
As a reference: An average human weights in at 62 kg (137 lbs) and reaches an average size of 1.65m (5′ 5″). Humans spend 280 days (40 weeks) in the womb of their mother and reach around 75 years of age.
Spix’s night monkey (Aotus vociferans) is a night monkey species from South America. It is found in Brazil, Colombia, Ecuador and Peru.The Spix’s night monkey is a small bodied monkey species usually having a mass ofaround one kilogram. It belongs to the only nocturnal genus of New World primatesAotus. This type of monkey can leap farther than most due to it having longer arms thanlegs. The monkey averages 0.5 meters in height. The night monkey is considered to bea new world monkey.The social behavior of the Aotus vociferans is group based. These groupsusually consist of breeding pairs and their offspring. This species has amonogamous mating system. After the offspring are born, the fatherbecomes the main caretaker, only giving up the offspring for them to suckle. The offspring willusually stay with their birth group until they reach two and a half to three and a half yearsold. An exception to this if the male breeding partner is no longer present for any reason(usually only caused by death), then the offspring may stay with its birth group for onlytwelve weeks to the normal departure age. Social grooming in this species of monkey isuncommon.The Aotus vociferans reproduce usually by giving birth to one offspring. Although, like with humans, there are cases of twins. The female breeding partner carries the offspring in interbirth for around one year. Both mating and birthing occur between November andJanuary. For this species, copulation attempts tend to be short and quick, starting with the male and female approaching oneanother. Then the male performs a social sniff. During the original sniff, the female mayreciprocate but not always. Sexual intercourse usually consists of only threeto four thrusts by the male with him ejaculating on the final thrust.This species moves through the forest by swinging between horizontal branchesand uses all four limbs to grab branches. They may also leap from tree to tree.This species communicates through voice, sight, smell, and touch. Vocally, this monkey has different sounds for different situations. To startle a potential predator the night monkey will “scream,” emitting a high pitched shriek. These monkeys use social sniffing to assesspotential breeding partners. They will also urinate on their hands and then rub it on differentsurfaces to show sexual attraction. Aggressive males will usually arch their backswith all of their limbs straightened. When in the presence of a predator the night monkeywill sway from side to side to try and deter the predator. A rejection bite is used astactile communication between mother and offspring after suckling or after around oneweek old when contact is not welcome. Father and offspring also use a rejection bite when the offspringreaches around 8 weeks when contact is not welcome.
Animals of the same family as a Spix’s night monkey
We found other animals of the Cebidae family:
- Coppery titi bringing 1.12 kilos (2.47 lbs) to the scale
- Kaapori capuchin bringing 3 kilos (6.61 lbs) to the scale
- Black-capped squirrel monkey with a weight of 802 grams
- Black bearded saki bringing 2.97 kilos (6.55 lbs) to the scale
- Aotus infulatus with a weight of 800 grams
- Monk saki bringing 2.11 kilos (4.65 lbs) to the scale
- Black squirrel monkey with a weight of 784 grams
- Guatemalan black howler bringing 7.19 kilos (15.85 lbs) to the scale
- Guianan squirrel monkey with a weight of 750 grams
- Yellow-tailed woolly monkey bringing 8.27 kilos (18.23 lbs) to the scale
Animals with the same weight as a Spix’s night monkey
As a comparison, here are some other animals that weight as much as the Aotus vociferans:
- Muskrat bringing 992 grams to the scale
- Angolan kusimanse bringing 700 grams to the scale
- Grey-headed flying fox bringing 702 grams to the scale
- Cuban solenodon bringing 806 grams to the scale
- Maned rat bringing 755 grams to the scale
- Western gray squirrel bringing 704 grams to the scale
- Bare-eared squirrel monkey bringing 888 grams to the scale
- Ring-tailed vontsira bringing 815 grams to the scale
- Mottle-faced tamarin bringing 803 grams to the scale
- Hershkovitz’s titi bringing 992 grams to the scale
Animals with the same litter size as a Spix’s night monkey
Here is a list of animals that have the same number of babies per litter (1) as a Spix’s night monkey: