[2] It largely resembles the female of the far more common Bolivian squirrel monkey, though the latter lacks the black central back.

[4] This squirrel monkey has one of the most restricted geographical distributions for a primate, living in várzea forest in the confluence of the Japura and Solimões rivers.

[5] It is a social primate that travels with other black squirrel monkeys in large troops within its habitat.

[8] The black fur above their eyes forms a shallow arch and is lower on their foreheads than other species.

[8] On average, black squirrel monkeys live up to 15 years in their natural habitat, the várzea forest.

[9] Black squirrel monkeys reside within the Mamirauá Sustainable Development Reserve in Brazil.

[5] The black squirrel monkeys inhabit a smaller ranged area than the other two species within the reserve.

[5] The black squirrel monkey species is declared endangered because of their limited range in the várzea forest.

[6] The change in climate due to global warming is also affecting the lives of the black squirrel monkey species.

[7] It prefers fruit and insects, but also eats leaves, flowers, seeds, eggs, and small vertebrates.