Gray-shanked Douc Langur vs Long-tailed Sylph

Pygathrix cinerea compared with Aglaiocercus kingii

Key Differences

• Gray-shanked Douc Langur is Critically Endangered while Long-tailed Sylph is Least Concern.

Taxonomic Classification

Rank	Gray-shanked Douc Langur	Long-tailed Sylph
Kingdom same	Animalia (حيوانات)	Animalia (حيوانات)
Phylum same	Chordata (حبليات)	Chordata (حبليات)
Class	Mammalia (ثدييات)	Aves (طيور)
Order	Primates (رئيسيات)	Apodiformes (سماميات)
Family	Cercopithecidae (Old World Monkeys)	Trochilidae
Genus	Pygathrix	Aglaiocercus
Species	Pygathrix cinerea	Aglaiocercus kingii

Evolutionary Relationship

Gray-shanked Douc Langur and Long-tailed Sylph share a common ancestor at the Phylum level: Chordata. (حبليات)

Conservation Status

Gray-shanked Douc Langur

CR — Critically Endangered

Long-tailed Sylph

LC — Least Concern

Physical Characteristics

Attribute	Gray-shanked Douc Langur	Long-tailed Sylph
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Gray-shanked Douc Langur

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

Long-tailed Sylph

Habitat

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

Range

Distributed across Colombia, Ecuador, Norway, and Venezuela.

Long-tailed Sylph

One of the most strikingly ornamented hummingbirds, male long-tailed sylphs have iridescent green plumage and dramatically elongated, ribbon-like outer tail feathers reaching up to 22 cm — over three times the body length. Found in Andean cloud forests of Colombia and Venezuela, they inhabit humid montane forest between 1,400–2,800 meters elevation. Males perform elaborate display flights to attract females. Their extravagant tails are a classic example of sexual selection via female preference.