Green-tailed Trainbearer vs Humboldt's Squirrel Monkey

Lesbia nuna compared with Saimiri cassiquiarensis

Key Differences

• Green-tailed Trainbearer is Least Concern while Humboldt's Squirrel Monkey is Near Threatened.

Taxonomic Classification

Rank	Green-tailed Trainbearer	Humboldt's Squirrel Monkey
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Chordata (Chordates)	Chordata (Chordates)
Class	Aves (Birds)	Mammalia (Mammals)
Order	Apodiformes (Apodiformes)	Primates (Primates)
Family	Trochilidae	Cebidae
Genus	Lesbia	Saimiri
Species	Lesbia nuna	Saimiri cassiquiarensis

Evolutionary Relationship

Green-tailed Trainbearer and Humboldt's Squirrel Monkey share a common ancestor at the Phylum level: Chordata. (Chordates)

Conservation Status

Green-tailed Trainbearer

LC — Least Concern

Humboldt's Squirrel Monkey

NT — Near Threatened

Physical Characteristics

Attribute	Green-tailed Trainbearer	Humboldt's Squirrel Monkey
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Green-tailed Trainbearer

Habitat

Typically found in various aerial, terrestrial, and aquatic environments.

Range

Distributed across Colombia, Ecuador, Norway, and Venezuela.

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.

Green-tailed Trainbearer

A medium-sized Andean hummingbird with a long, deeply forked green tail — the longest tail relative to body size among trainbearer hummingbirds — male green-tailed trainbearers inhabit open grassland, scrub, and Andean hedgerows from Ecuador to Bolivia at elevations of 2,000–4,000 meters. Males perform aerial display flights with the ornamental tail streaming behind. Found in semi-open Andean landscapes including gardens, agricultural areas, and páramo edges where they feed at diverse flowering plants.

Shared Countries

Both species can be found in 2 countries:

🇨🇴 Colombia 🇪🇨 Ecuador