Alouatta seniculus
Silhouette: PhyloPic
In 3 days ~90% in a week >90%
The Colombian red howler or Venezuelan red howler (Alouatta seniculus) is a South American species of howler monkey, a type of New World monkey, found in the western Amazon Basin in Venezuela, Colombia, Ecuador, Peru and Brazil. The population in the Santa Cruz Department in Bolivia was split off as a separate species, the Bolivian red howler, in 1986, and more recently, splitting off the population in northeastern South America and Trinidad as the Guyanan red howler has occurred. All howler monkeys belong to the family Atelidae and the infraorder Platyrrhini (New World monkeys).
Sexual dimorphism in this species is small; males range from 49 to 72 cm and females from 46 to 57 cm long. The males weigh 5.4–9 kg, while females weigh 4.2–7 kg. It has a long prehensile tail of 49–75 cm. The tail is covered with fur except for the last third of the underside, which allows it to grab branches. The color of both males and females is a deep reddish-brown, and the color shade changes with age. Their faces are surrounded by fur and they have stubby noses.
The jawbone of the red howler monkey is large, especially the body of the mandible. The position of the foramen magnum... Wikipedia →
Call0:29
Ecuador · 2025
© Marc Anderson · XC979159 · CC BY-NC-ND 4.0
Recording0:26
Brazil · 2025
© michelepaulo · iNaturalist · CC BY-NC 4.0
Recording0:05
Colombia · 2025
© Moses J. Michelsohn · iNaturalist · CC BY-NC 4.0
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Tayrona National Natural Park | 🇨🇴 Colombia | |
| 2 | Sierra de la Macarena National Park | 🇨🇴 Colombia | |
| 3 | Cuyabeno Wildlife Reserve | 🇪🇨 Ecuador | |
| 4 | Yasuní National Park | 🇪🇨 Ecuador | |
| 5 | Manu National Park | 🇵🇪 Peru | |
| 6 | Tambopata National Reserve | 🇵🇪 Peru | |
| 7 | Los Nevados National Natural Park | 🇨🇴 Colombia |
| # | Zoo / Centre | Country | |
|---|---|---|---|
| 1 | Dublin Zoo | 🇮🇪 Ireland | |
| 2 | Dresden Zoo | 🇩🇪 Germany | |
| 3 | Nanjing Hongshan Forest Zoo | 🇨🇳 China | |
| 4 | Yorkshire Wildlife Park | 🇬🇧 United Kingdom | |
| 5 | Night Safari | 🇸🇬 Singapore | |
| 6 | Singapore Zoo | 🇸🇬 Singapore | |
| 7 | Cologne Zoological Garden | 🇩🇪 Germany | |
| 8 | Apenheul Primate Park | 🇳🇱 Netherlands | |
| 9 | Vogelpark Avifauna | 🇳🇱 Netherlands | |
| 10 | River Wonders | 🇸🇬 Singapore | |
| 11 | Parque de la Conservación | 🇨🇴 Colombia | |
| 12 | Arequipa zoo | 🇵🇪 Peru | |
| 13 | zoologico de barranquilla | 🇨🇴 Colombia | |
| 14 | Cologne Zoo Aquarium | 🇩🇪 Germany |
Likely
About 50% of wildlife watchers report a Colombian Red Howler Monkey sighting in Yasuní National Park on a given day, based on 151 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 3rd most-seen of the 33 mammals we can rate there. Over three days the chance rises to about 90%, and over a week to over 90%, if each day is a fresh chance.
March–April and August
In those months about 60% of wildlife watchers report a Colombian Red Howler Monkey in Yasuní National Park on a given day, against about 20% in December, the lowest month.
Between 8 and 11 am
Across all the parks we cover, that three-hour window holds the most Colombian Red Howler 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.
4th of 7
Of the 7 parks where we can rate Colombian Red Howler Monkey sightings, Yasuní National Park ranks 4th at about 50%. The best odds are in Tayrona National Natural Park (Colombia, about 70%), Sierra de la Macarena National Park (Colombia, about 50%) and Cuyabeno Wildlife Reserve (Ecuador, about 50%). All parks ranked.
Same family: Atelidae
The closest relatives of the Colombian Red Howler Monkey that you can see in Yasuní National Park (family Atelidae, Spider, Howler, and Woolly Monkeys) are Common Woolly Monkey (about 60%) and Long-haired Spider Monkey (about 30%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Colombian Red Howler Monkey is recorded against all the mammals logged in Yasuní National Park (151 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.
