Ateles belzebuth
Silhouette: Steven Traver · PhyloPic
In 3 days ~60% in a week ~90%
The white-bellied spider monkey (Ateles belzebuth), also known as the white-fronted or long-haired spider monkey, is an endangered species of spider monkey, a type of New World monkey. It is found in the north-western Amazon in Colombia, Ecuador, Venezuela, Peru and Brazil, ranging as far south as the lower Ucayali River and as far east as the Branco River. In the past, the Peruvian, brown and white-cheeked spider monkeys have been treated as subspecies of A. belzebuth. As presently defined, the white-bellied spider monkey is monotypic. It has a whitish belly and a pale patch on the forehead, which, despite its common name, often is orange-buff, though this might be due to dirt and other stainers. They live in groups of 20 to 40 individuals, splitting into small parties of 1 to 9 when in activity.
Vernacular names include mono prieto, mico prieto and marimonda (Colombia). Over the last 45 years (3 generations), the population has declined by approximately 50% due to habitat loss and hunting. Because of this, A. belzebuth is listed as endangered by the IUCN.
White-bellied spider monkeys are important long-distance seed dispersal agents for many fruit-bearing species. They... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Yasuní National Park | 🇪🇨 Ecuador | |
| 2 | Sierra de la Macarena National Park | 🇨🇴 Colombia |
Possible
About 30% of wildlife watchers report a Long-haired Spider Monkey sighting in Yasuní National Park on a given day, based on 51 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 12th most-seen of the 33 mammals we can rate there. Over three days the chance rises to about 60%, and over a week to about 90%, if each day is a fresh chance.
June and October
In those months about 40% of wildlife watchers report a Long-haired Spider Monkey in Yasuní National Park on a given day, against under 5% in November, the lowest month.
Between 8 and 11 am
Across all the parks we cover, that three-hour window holds the most Long-haired Spider Monkey sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Yes
Of the 2 parks where we can rate Long-haired Spider Monkey sightings, Yasuní National Park has the highest daily chance: about 30%. Next come Sierra de la Macarena National Park (Colombia, about 20%).
Same family: Atelidae
The closest relatives of the Long-haired Spider Monkey that you can see in Yasuní National Park (family Atelidae, Spider, Howler, and Woolly Monkeys) are Common Woolly Monkey (about 60%) and Colombian Red Howler Monkey (about 50%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Long-haired Spider Monkey is recorded against all the mammals logged in Yasuní National Park (51 verified sightings from 2019 to 2026), calibrated against known sighting rates. Figures are rounded to the nearest 10% because citizen-science data supports honest approximations, not decimals, and months with records from fewer than five people show "—". How it works.
