Saimiri cassiquiarensis
Silhouette: PhyloPic
In 3 days ~80% in a week >90%
Humboldt's squirrel monkey (Saimiri cassiquiarensis) is a species of squirrel monkey from Brazil, Colombia, Ecuador, Peru and Venezuela. It had previously been considered a subspecies of the common squirrel monkey, S. sciureus, but was elevated to full species status based on a genetic study by Carretero-Pinzón in 2009. A genetic study by Jessica Lynch Alfaro, et al indicated that the Ecuadorian squirrel monkey may be synonymous with Saimiri cassiquiarensis. As of 2018, the Ecuadorian squirrel monkey is generally regarded as a subspecies of Humboldt's squirrel monkey, S. cassiquiarensis macrodon.
Humboldt's squirrel monkey have a head and body length of between 25 and 37 cm (9.8 and 14.6 in) with a tail between 36 and 45 cm (14 and 18 in). Its coloration is similar to that of the Guianan squirrel monkey but the fur on the base of the crown is golden yellow as compared with gray for the Guianan squirrel monkey. It eats fruits when available, primarily between January and June, and also eats insects. It is named after the Prussian naturalist and explorer Alexander von Humboldt (1769-1859). Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Sierra de la Macarena National Park | 🇨🇴 Colombia |
More parks will be added in future updates.
| # | Zoo / Centre | Country | |
|---|---|---|---|
| 1 | Parque Temático Hacienda Nápoles | 🇨🇴 Colombia | |
| 2 | Guadalajara Zoo | 🇲🇽 Mexico | |
| 3 | Ukumarí Biopark | 🇨🇴 Colombia | |
| 4 | Chapultepec Zoo | 🇲🇽 Mexico | |
| 5 | Bioparque Los Ocarros | 🇨🇴 Colombia | |
| 6 | Safari Masai Mara | 🇲🇽 Mexico | |
| 7 | Parque de la Conservación | 🇨🇴 Colombia | |
| 8 | Zoo El Pantanal | 🇪🇨 Ecuador |
Likely
About 40% of wildlife watchers report a Humboldt’s Squirrel Monkey sighting in Sierra de la Macarena National Park on a given day, based on 8 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 2nd most-seen of the 6 mammals we can rate there. Over three days the chance rises to about 80%, and over a week to over 90%, if each day is a fresh chance.
February–April and July
In those months about 60% of wildlife watchers report a Humboldt’s Squirrel Monkey in Sierra de la Macarena National Park on a given day, against about 10% in January and September–November, the lowest months.
Between 7 and 10 am
Across all the parks we cover, that three-hour window holds the most Humboldt’s Squirrel 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.
Only Sierra de la Macarena National Park, in our data
Sierra de la Macarena National Park is the only park on Wallace's Line with enough records to rate Humboldt’s Squirrel Monkey sightings: about 40% of wildlife watchers there report one on a given day.
GBIF citizen-science records
It is estimated from how often the Humboldt’s Squirrel Monkey is recorded against all the mammals logged in Sierra de la Macarena National Park (8 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.
