Eurasian Eagle-Owl vs Long-tailed Sylph

Bubo bubo compared with Aglaiocercus kingii

Key Differences

• Eurasian Eagle-Owl is Endangered while Long-tailed Sylph is Least Concern.

Taxonomic Classification

Rank	Eurasian Eagle-Owl	Long-tailed Sylph
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Chordata (Chordates)	Chordata (Chordates)
Class same	Aves (Birds)	Aves (Birds)
Order	Strigiformes (Owls)	Apodiformes (Apodiformes)
Family	Strigidae (True Owls)	Trochilidae
Genus	Bubo (Eagle Owls)	Aglaiocercus
Species	Bubo bubo	Aglaiocercus kingii

Evolutionary Relationship

Eurasian Eagle-Owl and Long-tailed Sylph share a common ancestor at the Class level: Aves. (Birds)

Conservation Status

Eurasian Eagle-Owl

EN — Endangered

Population: ~400.0K

Trend: Stable →

Long-tailed Sylph

LC — Least Concern

Physical Characteristics

Attribute	Eurasian Eagle-Owl	Long-tailed Sylph
Diet	Carnivore	—
Average Lifespan	20 years	—
Average Length	70 cm	—
Average Weight	3.0 kg	—

Habitat & Geographic Range

Eurasian Eagle-Owl

Habitat

Found across multiple habitat types including tropical and subtropical dry broadleaf forests, flooded grasslands and savannas, and montane grasslands and shrublands, among 4 distinct biome types within the Neotropic biogeographic realm.

Range

Found across Europe (9 countries) and South America (Ecuador). Currently classified as 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.

Eurasian Eagle-Owl

The world's largest owl species by height and weight, Eurasian eagle-owls have wingspans up to 1.9 meters and inhabit rocky landscapes, forest edges, and cliffs from Europe across Asia to China. Silent nocturnal hunters with powerful talons, they prey on rabbits, hares, foxes, and even other raptors. Their deep, resonant hooting carries over great distances. Relatively stable in population, though persecuted historically.

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 2 countries:

🇪🇨 Ecuador 🇳🇴 Norway