Long-tailed Sylph vs Obscure Bell

Aglaiocercus kingii compared with Eucosma aemulana

Key Differences

• Long-tailed Sylph is Least Concern while Obscure Bell is Vulnerable.

Taxonomic Classification

Rank	Long-tailed Sylph	Obscure Bell
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum	Chordata (Chordates)	Arthropoda (Arthropods)
Class	Aves (Birds)	Insecta (Insects)
Order	Apodiformes (Apodiformes)	Lepidoptera (Butterflies & Moths)
Family	Trochilidae	Tortricidae
Genus	Aglaiocercus	Eucosma
Species	Aglaiocercus kingii	Eucosma aemulana

Evolutionary Relationship

Long-tailed Sylph and Obscure Bell share a common ancestor at the Kingdom level: Animalia. (Animals)

Conservation Status

Long-tailed Sylph

LC — Least Concern

Obscure Bell

VU — Vulnerable

Physical Characteristics

Attribute	Long-tailed Sylph	Obscure Bell
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Long-tailed Sylph

Habitat

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

Range

Distributed across Colombia, Ecuador, Norway, and Venezuela.

Obscure Bell

Habitat

Typically found in virtually all terrestrial and freshwater habitats.

Range

Distributed across Belgium, Denmark, Norway, and Sweden. Currently classified as Vulnerable on the IUCN Red List, this species faces significant conservation challenges across its range.

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.

Shared Countries

Both species can be found in 1 countries:

🇳🇴 Norway