Bennett's cowtail vs Long-tailed Sylph

Hemitrygon bennettii compared with Aglaiocercus kingii

Key Differences

• Bennett's cowtail is Vulnerable while Long-tailed Sylph is Least Concern.

Taxonomic Classification

Rank	Bennett's cowtail	Long-tailed Sylph
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Chordata (Chordates)	Chordata (Chordates)
Class	Elasmobranchii	Aves (Birds)
Order	Myliobatiformes (Myliobatiformes)	Apodiformes (Apodiformes)
Family	Dasyatidae	Trochilidae
Genus	Hemitrygon	Aglaiocercus
Species	Hemitrygon bennettii	Aglaiocercus kingii

Evolutionary Relationship

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

Conservation Status

Bennett's cowtail

VU — Vulnerable

Long-tailed Sylph

LC — Least Concern

Physical Characteristics

Attribute	Bennett's cowtail	Long-tailed Sylph
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Bennett's cowtail

Habitat

Native to Asia, inhabiting ecosystems characteristic of the region.

Range

Found in Taiwan. Currently classified as Vulnerable on the IUCN Red List, this species faces significant conservation challenges across its range.

Long-tailed Sylph

Habitat

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

Range

Distributed across Colombia, Ecuador, Norway, and Venezuela.

Bennett's cowtail

The Bennett's cowtail (Hemitrygon bennettii) is a species in the genus Hemitrygon. It is currently classified as Vulnerable on the IUCN Red List. Native to Asia, inhabiting ecosystems characteristic of the region.

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.