Crested Shelduck vs Long-tailed Sylph

Tadorna cristata compared with Aglaiocercus kingii

Key Differences

• Crested Shelduck is Critically Endangered while Long-tailed Sylph is Least Concern.

Taxonomic Classification

Rank	Crested Shelduck	Long-tailed Sylph
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Chordata (Chordates)	Chordata (Chordates)
Class same	Aves (Birds)	Aves (Birds)
Order	Anseriformes (Anseriformes)	Apodiformes (Apodiformes)
Family	Anatidae	Trochilidae
Genus	Tadorna	Aglaiocercus
Species	Tadorna cristata	Aglaiocercus kingii

Evolutionary Relationship

Crested Shelduck and Long-tailed Sylph share a common ancestor at the Class level: Aves. (Birds)

Conservation Status

Crested Shelduck

CR — Critically Endangered

Long-tailed Sylph

LC — Least Concern

Physical Characteristics

Attribute	Crested Shelduck	Long-tailed Sylph
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Crested Shelduck

Habitat

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

Range

Found in Norway. Currently classified as Critically Endangered 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.

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