# Proboscis monkey (*Nasalis larvatus*)

Canonical page: https://creaturedata.com/animals/proboscis-monkey  
Data as of: 2026-11-11

The proboscis monkey (Nasalis larvatus), also called the nasal ape or long-nosed monkey, is a primate of the family Cercopithecidae and subfamily Colobinae. It is a medium-sized mammal with an adult body mass of 9 kg, and our sources report values up to 20.72 kg. The proboscis monkey is a diurnal, scansorial herbivore. It is listed as Endangered on the IUCN Red List, an IUCN threatened category.

## Quick facts

| Fact | Value |
|---|---|
| Weight | 9 kg – 20.7 kg |
| Length | Not recorded |
| Lifespan | 21 years – 25.1 years |
| Diet | Herbivore |
| Main food | Not recorded |
| Habitat | coastal, forest |
| Gestation | 167 days |
| Young per litter or clutch | 1.01 |
| Age at maturity | 4.5 years |
| Litters or clutches a year | 0.7 |
| Active | By day (diurnal) |
| Lifestyle | Scansorial |
| Conservation status | Endangered (IUCN) |
| Countries on record | Not recorded |

## Classification

- kingdom: Animalia
- phylum: Chordata
- class: Mammalia
- order: Primates
- family: Cercopithecidae
- genus: Nasalis
- species: *Nasalis larvatus* (van Wurmb, 1787)

Synonyms: *Cercopithecus larvatus*, *Cercopithecus nasica*, *Nasalis capistratus*, *Nasalis larvatus orientalis*, *Nasalis nasica*, *Nasalis recurvus*, *Simia capistratus*

## Common questions

### What kind of animal is the proboscis monkey?

The proboscis monkey is a primate in the family Cercopithecidae and subfamily Colobinae. It belongs to the class Mammalia.

### How heavy is a proboscis monkey?

An adult proboscis monkey has a body mass of 9 kg. The highest value reported by our sources is 20.72 kg.

### What does the proboscis monkey eat?

The proboscis monkey is a herbivore.

### Is the proboscis monkey endangered?

Yes. The proboscis monkey is listed as Endangered (EN) on the IUCN Red List, an IUCN threatened category.

### How long does a proboscis monkey live?

The proboscis monkey has a lifespan of 21 years, and our sources report values up to 25.1 years.

### How many young does a proboscis monkey have?

A proboscis monkey has 1 young per litter, with 0.7 litters per year. Gestation lasts 167.2 days.

### When does a proboscis monkey reach sexual maturity?

The proboscis monkey reaches sexual maturity at 4.5 years (1,644 days).

### Who named the proboscis monkey?

The scientific name Nasalis larvatus is attributed to (van Wurmb, 1787).

## Sources

- [An amniote life-history database to perform comparative analyses with birds, mammals, and reptiles](https://doi.org/10.6084/m9.figshare.3563457.v1), CC0 1.0, E096-269. Myhrvold, N.P., Baldridge, E., Chan, B., Sivam, D., Freeman, D.L. & Ernest, S.K.M. (2015) An amniote life-history database to perform comparative analyses with birds, mammals, and reptiles. Ecology 96: 3109. https://doi.org/10.1890/15-0846R.1. Data: https://doi.org/10.6084/m9.figshare.3563457.v1
- [Catalogue of Life eXtended Release](https://www.checklistbank.org/dataset/316691), CC BY 4.0, 2026-10-16 XR. Catalogue of Life (2026). Catalogue of Life eXtended Release, version 2026-10-16 XR. Catalogue of Life Foundation, Amsterdam, Netherlands. https://doi.org/10.48580/dgzlf
- [Wikimedia Commons](https://commons.wikimedia.org), per file (CC0 / public domain / CC BY green, CC BY-SA amber, anything else not displayed), 2026-11-11. Wikimedia Commons contributors. Wikimedia Commons. https://commons.wikimedia.org (each file credited to its author under its own licence).
- [EltonTraits 1.0: species-level foraging attributes of the world's birds and mammals](https://doi.org/10.6084/m9.figshare.3559887.v1), CC0 1.0, 1.0. Wilman, H., Belmaker, J., Simpson, J., de la Rosa, C., Rivadeneira, M.M. & Jetz, W. (2014) EltonTraits 1.0: Species-level foraging attributes of the world's birds and mammals. Ecology 95: 2027. https://doi.org/10.1890/13-1917.1. Data: https://doi.org/10.6084/m9.figshare.3559887.v1
- [Wikidata](https://www.wikidata.org), CC0 1.0, 2026-11-11. Wikidata contributors. Wikidata. https://www.wikidata.org (data retrieved via the Wikidata Query Service).
- [Wikipedia (English)](https://en.wikipedia.org), CC BY-SA 4.0, 2026-11-11. Wikipedia contributors. Wikipedia, The Free Encyclopedia. https://en.wikipedia.org (text under CC BY-SA 4.0; each block names its article and revision).

Cite as: Proboscis monkey (Nasalis larvatus). Retrieved from https://creaturedata.com/animals/proboscis-monkey