With long arms, a gripping tail and an acrobatic style, the spider monkey looks a little like a spider hanging in the trees. These agile primates are among the largest monkeys in Central and South America, and sadly some of the most threatened.
This guide covers the most interesting spider monkey facts, from their unusual hands to their diet, family life and conservation.
Spider Monkey Facts at a Glance
| Fact | Details |
|---|---|
| Genus | Ateles (seven species) |
| Range | Southern Mexico to Bolivia and Brazil |
| Body length | About 40 to 60 cm (16 to 24 inches) |
| Tail length | Up to about 90 cm (35 inches) |
| Weight | Roughly 6 to 10 kg (13 to 22 pounds) |
| Diet | Mostly ripe fruit, plus leaves, flowers and seeds |
| Lifespan | About 20 to 27 years in the wild; longer in captivity |
Why Do Spider Monkeys Have No Thumbs?
Spider monkeys have only a tiny thumb or none at all. Their long, hook-like fingers work perfectly for swinging from branch to branch, a way of moving called brachiation. A thumb would mostly get in the way.
A Tail That Works Like a Fifth Hand
The spider monkey’s prehensile tail is strong enough to hold its whole body weight. The underside near the tip has a bare, grooved patch, similar to a fingerprint, that gives extra grip. Spider monkeys can hang by the tail while using both hands to pick fruit.
What Do Spider Monkeys Eat?
Spider monkeys are frugivores, meaning ripe fruit makes up most of their diet. They also eat young leaves, flowers, seeds, bark and sometimes insects. Because they swallow fruit and later spread the seeds, they play a key role in regrowing rainforests.
Spider Monkey Social Life
Spider monkeys live in communities of about 20 to 40 individuals, but they rarely move together as one big group. Instead, they split into small parties during the day and come back together, a pattern scientists call fission-fusion. They keep in touch with whinnies, barks and screeches.
- Females usually leave their birth group when they mature, while males stay.
- A female gives birth to one baby about every two to four years.
- Babies ride on their mother’s belly, then her back, for many months.
How Long Do Spider Monkeys Live?
Wild spider monkeys typically live around 20 to 27 years. In zoos, some have lived past 40. Their slow breeding rate means populations recover slowly after hunting or habitat loss.
Are Spider Monkeys Endangered?
Yes, many are. Several spider monkey species are listed as endangered on the IUCN Red List, and the brown spider monkey is critically endangered. The main threats are:
- Deforestation for farming, logging and roads
- Hunting for meat
- Capture for the illegal pet trade
Spider monkey as a pet?
Spider monkeys are large, strong wild animals that need a troop and huge areas of forest. They are not suitable pets, and keeping primates is restricted or banned in many places. The best way to help them is to support rainforest conservation.
How Spider Monkeys Help Rainforests
Spider monkeys swallow many fruit seeds whole and pass them out far from the parent tree. Scientists consider them important seed dispersers, helping large fruit trees spread and regrow. When spider monkeys disappear from an area, some tree species may struggle to reproduce.
Where to See Spider Monkeys
You can see spider monkeys in protected areas across Central and South America, such as national parks in Costa Rica, Mexico, Peru and Brazil, and at accredited zoos that take part in breeding and conservation programs. Always use licensed guides and keep a respectful distance.
Note: This article is general information. Primate ownership laws vary by location.
Helpful Resources
More guides from Pet Guide Nest:
Trusted outside sources:
Frequently Asked Questions
Why are they called spider monkeys?
Their long, thin limbs and tail make them look like a spider when they hang from branches.
Do spider monkeys have thumbs?
They have only a tiny thumb or none at all. Their hook-shaped fingers are built for swinging through trees.
What do spider monkeys eat?
Mostly ripe fruit, along with leaves, flowers, seeds and occasionally insects.
Are spider monkeys endangered?
Several species are endangered, and the brown spider monkey is critically endangered, mainly due to habitat loss and hunting.
Final Thoughts
Spider monkeys are graceful gardeners of the rainforest, spreading seeds as they swing through the canopy. Protecting their forests protects them, along with thousands of other species that share their home.
Maren Ashcroft
Maren Ashcroft writes the care guides at Pet Guide Nest. She has grown up around dogs, cats, and rabbits and loves learning about the more unusual pets too. She turns vet and animal welfare research into simple, practical advice for everyday pet owners.
