Saimiri macrodon
Silhouette: PhyloPic
In 3 days ~90% in a week >90%
The Ecuadorian squirrel monkey (Saimiri cassiquiarensis macrodon) is a type of squirrel monkey. It had been considered a subspecies of the Guianan squirrel monkey, Saimiri sciureus, but was elevated to a full species, S. macrodon, based on a 2009 study by Carretero-Pinzón, et al. Based on subsequent genetic research by Jessica Lynch Alfaro, et al it was again reclassified as a subspecies of Humboldt's squirrel monkey.
The Ecuadorian squirrel monkey lives in the western Brazilian Amazon, as well as southern Colombia, eastern Ecuador and northern and eastern Peru. It lives in humid tropical and subtropical forest, preferring dense forest but able to live in secondary forest and disturbed forest as well. It can live at elevations up to 1,200 m (3,900 ft), but where it has been studied in Ecuador it prefers elevations under 500 m (1,600 ft).
The Ecuadorian squirrel monkey has a head and body length of between 25 and 32 cm (9.8 and 12.6 in) with a tail length between 34 and 44 cm (13 and 17 in). Males weigh between 885 and 1,380 g (31.2 and 48.7 oz) and females weigh between 590 and 1,150 g (21 and 41 oz). Its coloration is similar to that of the Guianan squirrel monkey but its fur is darker. Wikipedia →
Alarm call0:09
Ecuador · 2021
© Manuel Sánchez-Nivicela · XC1027021 · CC BY-NC-ND 4.0
Call0:48
Ecuador · 2025
© Marc Anderson · XC979834 · CC BY-NC-ND 4.0
Recording1:08
Brazil · 2022
© Thiago Bicudo · iNaturalist · CC BY 4.0
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Cuyabeno Wildlife Reserve | 🇪🇨 Ecuador | |
| 2 | Yasuní National Park | 🇪🇨 Ecuador | |
| 3 | Amacayacu National Natural Park | 🇨🇴 Colombia | |
| 4 | Sierra de la Macarena National Park | 🇨🇴 Colombia |
| # | Zoo / Centre | Country | |
|---|---|---|---|
| 1 | Seoul Zoo | 🇰🇷 South Korea | |
| 2 | Gembira Loka Zoo | 🇮🇩 Indonesia | |
| 3 | Amaru | 🇪🇨 Ecuador | |
| 4 | Parque de las Leyendas | 🇵🇪 Peru | |
| 5 | Ecozoológico San Martín | 🇪🇨 Ecuador | |
| 6 | Zoo Criadero Tarqui | 🇪🇨 Ecuador | |
| 7 | Zoo El Pantanal | 🇪🇨 Ecuador | |
| 8 | Monkey Park | 🇪🇸 Spain | |
| 9 | Amazon Rescue Center | 🇵🇪 Peru | |
| 10 | Wiwa Quito | 🇪🇨 Ecuador |
Likely
About 50% of wildlife watchers report an Ecuadorian Squirrel Monkey sighting in Yasuní National Park on a given day, based on 162 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 2nd 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.
February, June and August–September
In those months about 60% of wildlife watchers report an Ecuadorian Squirrel Monkey in Yasuní National Park on a given day, against about 40% in October and November, the lowest months.
Between 3 and 6 pm
Across all the parks we cover, that three-hour window holds the most Ecuadorian Squirrel Monkey sightings with a recorded time, and about 8 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
2nd of 4
Of the 4 parks where we can rate Ecuadorian Squirrel Monkey sightings, Yasuní National Park ranks 2nd at about 50%. The best odds are in Cuyabeno Wildlife Reserve (Ecuador, about 70%). All parks ranked.
GBIF citizen-science records
It is estimated from how often the Ecuadorian Squirrel Monkey is recorded against all the mammals logged in Yasuní National Park (162 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.
