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Southern Muriqui (Brachyteles arachnoides)

Mammals · Primates · Atelidae

Southern Muriqui

Brachyteles arachnoides

Critically Endangered

At extremely high risk of imminent extinction in the wild.

Spotted something wrong?

The southern muriqui or woolly spider monkey is the largest primate in the Americas and one of the most threatened. It lives only in the remnants of the Brazilian Atlantic Forest, of which less than a tenth of the original area survives. It has long arms, a prehensile tail and dense yellowish-brown fur. It is mainly folivorous, which lets it survive in fragments where fruit is seasonal, and it moves in large groups that split and regroup.

Weight

9 kg – 15 kg

Size

55 cm – 78 cm

Life expectancy

30 years

Diet

Herbivore

Feeds mainly on plants.

Activity

Diurnal

Active mainly during the day.

RainforestMountain
1countries6parks8same family

AI-generated images: illustrations, not photographs.

Fun facts

  • Its society is remarkably peaceful: the males do not compete through physical aggression, they embrace as a greeting and tolerate their rivals close by even in the presence of receptive females.
  • Competition between males is settled not by fighting but at the level of sperm: they have enormous testes in proportion to their body, a textbook case of post-copulatory selection.

Life cycle and biology

Skeleton type
Vertebrate - internal bony skeleton (mammal)
Habitat and environment
Fragments of montane Atlantic Forest in south-eastern Brazil
Sexual maturity
7.5 years
Gestation / incubation
7.6 months
Litter / clutch size
1

Sources consulted: Wikipedia (es): Brachyteles arachnoides

Where to find it

Loading map…

The pins mark the parks where its presence is documented.

Where to see it

Parks and dive sites where this species has been documented.

Related species

Other species in the catalogue with the most in common with Southern Muriqui — same habitat, park, country, tags or family.

Same taxonomic family
Same taxonomic family
Same taxonomic family
Same taxonomic family
Same taxonomic family
Same taxonomic family

How to help

The southern muriqui is classified as critically endangered. Organisations such as the IUCN, WWF and the Wildlife Conservation Society work specifically on its conservation and that of its habitat; looking into their programmes is a good starting point if you want to get involved.

It's documented in 5 protected areas — one reason why protecting these places matters for its conservation.

Keep exploring

Based on what we already know about southern muriqui.

Share an experience, a fun fact or a tip for seeing the southern muriqui.
See full glossary
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See its range on the interactive map→
ItatiaiaBrazil
Serra dos ÓrgãosBrazil
Atlantic Forest South-East ReservesBrazil
Serra da BocainaBrazil
SuperagüiBrazil
TijucaBrazil
Black and Gold Howler MonkeyLeast Concern

Black and Gold Howler Monkey

Alouatta caraya

Colombian Red Howler MonkeyLeast Concern

Colombian Red Howler Monkey

Alouatta seniculus

Endangered

Black Spider Monkey

Ateles chamek

Endangered

Common Woolly Monkey

Lagothrix lagothricha

Critically Endangered

Peruvian Yellow-tailed Woolly Monkey

Lagothrix flavicauda

Red-faced Black Spider MonkeyVulnerable

Red-faced Black Spider Monkey

Ateles paniscus

CountriesBrazil
ParksItatiaiaBrazil
TagsHerbivore
Herbivore
Diurnal
Critically Endangered
Rainforest
Mountain
Mammal
Brazil