Eld's Deer vs Long-tailed Sylph

Rucervus eldii compared with Aglaiocercus kingii

Key Differences

• Eld's Deer is Endangered while Long-tailed Sylph is Least Concern.

Taxonomic Classification

Rank	Eld's Deer	Long-tailed Sylph
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Chordata (Chordates)	Chordata (Chordates)
Class	Mammalia (Mammals)	Aves (Birds)
Order	Artiodactyla (Even-toed Ungulates)	Apodiformes (Apodiformes)
Family	Cervidae (Deer)	Trochilidae
Genus	Rucervus	Aglaiocercus
Species	Rucervus eldii	Aglaiocercus kingii

Evolutionary Relationship

Eld's Deer and Long-tailed Sylph share a common ancestor at the Phylum level: Chordata. (Chordates)

Conservation Status

Eld's Deer

EN — Endangered

Long-tailed Sylph

LC — Least Concern

Physical Characteristics

Attribute	Eld's Deer	Long-tailed Sylph
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Eld's Deer

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.