Viréo du Choco vs Kozlov’s Pygmy Jerboa

Vireo masteri compared with Salpingotus kozlovi

Key Differences

• Viréo du Choco is Endangered while Kozlov’s Pygmy Jerboa is Least Concern.

Taxonomic Classification

Rank	Viréo du Choco	Kozlov’s Pygmy Jerboa
Kingdom same	Animalia (animal)	Animalia (animal)
Phylum same	Chordata (Chordates)	Chordata (Chordates)
Class	Aves (oiseau)	Mammalia (mammifères)
Order	Passeriformes (passereaux)	Rodentia (Rodents)
Family	Vireonidae	Dipodidae
Genus	Vireo	Salpingotus
Species	Vireo masteri	Salpingotus kozlovi

Evolutionary Relationship

Viréo du Choco and Kozlov’s Pygmy Jerboa share a common ancestor at the Phylum level: Chordata. (Chordates)

Conservation Status

Viréo du Choco

EN — Endangered

Kozlov’s Pygmy Jerboa

LC — Least Concern

Physical Characteristics

Attribute	Viréo du Choco	Kozlov’s Pygmy Jerboa
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Viréo du Choco

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

Distributed across Colombia, Ecuador, and Norway. Currently classified as Endangered on the IUCN Red List, this species faces significant conservation challenges across its range.

Kozlov’s Pygmy Jerboa

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

Viréo du Choco

The Choco Vireo (Vireo masteri) is a small, poorly known passerine in the family Vireonidae, with a highly restricted range in the western Andes foothills on the Pacific slope of Colombia and possibly adjacent Ecuador. It was described scientifically only in 1997, reflecting the challenges of survey work in the remote, wet, and botanically complex terrain of the Colombian Chocó. The Choco Vireo is a small greenish-yellow vireo with a distinctive facial pattern including a pale supercilium and dark eye-stripe. Like other vireos, it forages methodically through mid-canopy and sub-canopy foliage, gleaning caterpillars, beetles, and other invertebrates from leaves. Its song is a series of high, slurred phrases repeated with characteristic vireonid persistence. The species appears restricted to humid montane and foothill forest at elevations roughly between 800 and 1,800 metres — a zone severely impacted by the expansion of coca cultivation, illegal logging, and cattle ranching in the Colombian Pacific region. The IUCN classifies the Choco Vireo as Endangered given its extremely small and severely fragmented range and continued loss of suitable forest habitat. Very little is known about its population size, ecology, or breeding biology, making targeted survey and monitoring urgently needed.