Black-thighed Puffleg vs Gray-cowled Wood-Rail

Eriocnemis derbyi compared with Aramides cajanea

Key Differences

• Black-thighed Puffleg is Near Threatened while Gray-cowled Wood-Rail is Least Concern.

Taxonomic Classification

Rank	Black-thighed Puffleg	Gray-cowled Wood-Rail
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Chordata (Chordates)	Chordata (Chordates)
Class same	Aves (Birds)	Aves (Birds)
Order	Apodiformes (Apodiformes)	Gruiformes (Gruiformes)
Family	Trochilidae	Rallidae
Genus	Eriocnemis	Aramides
Species	Eriocnemis derbyi	Aramides cajanea

Evolutionary Relationship

Black-thighed Puffleg and Gray-cowled Wood-Rail share a common ancestor at the Class level: Aves. (Birds)

Conservation Status

Black-thighed Puffleg

NT — Near Threatened

Gray-cowled Wood-Rail

LC — Least Concern

Physical Characteristics

Attribute	Black-thighed Puffleg	Gray-cowled Wood-Rail
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Black-thighed Puffleg

Habitat

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

Range

Distributed across Colombia, Ecuador, and Norway. Listed as Near Threatened, this species requires ongoing monitoring to prevent population decline.

Gray-cowled Wood-Rail

Habitat

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

Range

Distributed across Colombia, Ecuador, Norway, and Venezuela.

Black-thighed Puffleg

An Andean puffleg hummingbird named for the males' distinctive velvety black thighs contrasting with the characteristic white leg feather puffs, black-thighed pufflegs inhabit humid montane forest and forest edges in Ecuador and Colombia at elevations of 1,500–3,500 meters. Males display glittering green plumage with a violet-blue tail. Listed as Near Threatened due to deforestation of the Andean cloud forest, with populations declining as the specialized high-altitude forest habitat is cleared for agriculture.

Gray-cowled Wood-Rail

Gray-cowled Wood-Rail (Aramides cajanea) is classified as Least Concern (LC) on the IUCN Red List. Widespread and abundant across its range, with stable populations and no immediate conservation concerns.

Shared Countries

Both species can be found in 3 countries:

🇨🇴 Colombia 🇪🇨 Ecuador 🇳🇴 Norway