Constricted Treacle Mustard vs Long-tailed Sylph

Erysimum contractum compared with Aglaiocercus kingii

Key Differences

• Constricted Treacle Mustard is Vulnerable while Long-tailed Sylph is Least Concern.

Taxonomic Classification

Rank	Constricted Treacle Mustard	Long-tailed Sylph
Kingdom	Plantae (Plants)	Animalia (Animals)
Phylum	Magnoliophyta (Flowering Plants)	Chordata (Chordates)
Class	Magnoliopsida (Dicots)	Aves (Birds)
Order	Brassicales (Brassicales)	Apodiformes (Apodiformes)
Family	Brassicaceae	Trochilidae
Genus	Erysimum	Aglaiocercus
Species	Erysimum contractum	Aglaiocercus kingii

Conservation Status

Constricted Treacle Mustard

VU — Vulnerable

Long-tailed Sylph

LC — Least Concern

Physical Characteristics

Attribute	Constricted Treacle Mustard	Long-tailed Sylph
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Constricted Treacle Mustard

Habitat

Typically found in diverse terrestrial habitats from tropical forests to temperate regions.

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.