Gray-bellied Night Monkey vs Humboldt's Squirrel Monkey

Aotus lemurinus compared with Saimiri cassiquiarensis

Key Differences

• Gray-bellied Night Monkey is Vulnerable while Humboldt's Squirrel Monkey is Near Threatened.

Taxonomic Classification

Rank	Gray-bellied Night Monkey	Humboldt's Squirrel Monkey
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Chordata (Chordates)	Chordata (Chordates)
Class same	Mammalia (Mammals)	Mammalia (Mammals)
Order same	Primates (Primates)	Primates (Primates)
Family	Aotidae	Cebidae
Genus	Aotus	Saimiri
Species	Aotus lemurinus	Saimiri cassiquiarensis

Evolutionary Relationship

Gray-bellied Night Monkey and Humboldt's Squirrel Monkey share a common ancestor at the Order level: Primates. (Primates)

Conservation Status

Gray-bellied Night Monkey

VU — Vulnerable

Humboldt's Squirrel Monkey

NT — Near Threatened

Physical Characteristics

Attribute	Gray-bellied Night Monkey	Humboldt's Squirrel Monkey
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Gray-bellied Night Monkey

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

Range

Distributed across Colombia, Ecuador, and Venezuela. Currently classified as Vulnerable on the IUCN Red List, this species faces significant conservation challenges across its range.

Humboldt's Squirrel Monkey

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

Range

Distributed across Colombia and Ecuador. Listed as Near Threatened, this species requires ongoing monitoring to prevent population decline.

Shared Countries

Both species can be found in 2 countries:

🇨🇴 Colombia 🇪🇨 Ecuador