# Crab-eating macaque (*Macaca fascicularis*)

Canonical page: https://creaturedata.com/animals/crab-eating-macaque  
Data as of: 2026-11-11

The crab-eating macaque (Macaca fascicularis) is a primate in the family Cercopithecidae, also called the Cynomolgus monkey, Cynomolgus macaque or Long-tailed macaque. It is a medium-sized, diurnal, scansorial omnivore, with adult body mass values from 3.6 to 5.3 kg. It has one young per litter after a gestation period of 165 days and reaches sexual maturity at 3.9 years. The IUCN Red List classifies it as Endangered, a threatened category, and reported lifespan values go up to 39 years.

## Quick facts

| Fact | Value |
|---|---|
| Weight | 3.59 kg – 5.34 kg |
| Length | Not recorded |
| Lifespan | 37.6 years |
| Diet | Omnivore |
| Longest recorded lifespan | 39 years |
| Main food | Not recorded |
| Habitat | forest |
| Gestation | 165 days |
| Young per litter or clutch | 1 |
| Age at maturity | 3.5 years – 4.23 years |
| Litters or clutches a year | 0.93 |
| 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: Macaca
- species: *Macaca fascicularis* (Raffles, 1821)

Synonyms: *Macaca irus*, *Simia fascicularis*

## Common questions

### Is the crab-eating macaque endangered?

Yes. The IUCN Red List classifies the crab-eating macaque as Endangered (EN), a threatened category.

### How much does a crab-eating macaque weigh?

Adult crab-eating macaques weigh from 3.6 to 5.3 kg, with a representative value of 3.99 kg.

### What does the crab-eating macaque eat?

The crab-eating macaque is an omnivore.

### How long does a crab-eating macaque live?

Its lifespan is given as 37.55 years, with values up to 39 years.

### What kind of animal is the crab-eating macaque?

It is a mammal, a primate in the family Cercopithecidae and the genus Macaca.

### How many young does a crab-eating macaque have?

It has 1 young per litter, after a gestation period of 165 days.

### Who named the crab-eating macaque?

The scientific name Macaca fascicularis is credited to (Raffles, 1821).

## 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: Crab-eating macaque (Macaca fascicularis). Retrieved from https://creaturedata.com/animals/crab-eating-macaque