Common Fat-tailed Mouse Opossum vs Paraguayan Fat-tailed Mouse Opossum

Thylamys pusillus compared with Thylamys macrurus

Key Differences

• Common Fat-tailed Mouse Opossum is Least Concern while Paraguayan Fat-tailed Mouse Opossum is Near Threatened.

Taxonomic Classification

Rank	Common Fat-tailed Mouse Opossum	Paraguayan Fat-tailed Mouse Opossum
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Chordata (Chordates)	Chordata (Chordates)
Class same	Mammalia (Mammals)	Mammalia (Mammals)
Order same	Didelphimorphia (Didelphimorphia)	Didelphimorphia (Didelphimorphia)
Family same	Didelphidae	Didelphidae
Genus same	Thylamys	Thylamys
Species	Thylamys pusillus	Thylamys macrurus

Evolutionary Relationship

Common Fat-tailed Mouse Opossum and Paraguayan Fat-tailed Mouse Opossum share a common ancestor at the Genus level: Thylamys.

Conservation Status

Common Fat-tailed Mouse Opossum

LC — Least Concern

Paraguayan Fat-tailed Mouse Opossum

NT — Near Threatened

Physical Characteristics

Attribute	Common Fat-tailed Mouse Opossum	Paraguayan Fat-tailed Mouse Opossum
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Common Fat-tailed Mouse Opossum

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

Paraguayan Fat-tailed Mouse Opossum

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

Common Fat-tailed Mouse Opossum

The Common Fat-tailed Mouse Opossum (<em>Thylamys pusillus</em>) is a small marsupial belonging to the genus Thylamys within the family Didelphidae. Like other members of its genus, this species typically stores fat in its tail, which becomes swollen during periods of food abundance and is metabolised during leaner times, a physiological adaptation that provides energy reserves. <em>Thylamys pusillus</em> is generally found in diverse terrestrial and aquatic ecosystems, often in dry woodlands, scrublands, and grassland habitats of South America. The species is assessed as Least Concern on the IUCN Red List, indicating it is not currently considered at risk of extinction. Detailed geographic range data are not available in the current record, but members of this genus are typically distributed across parts of Argentina, Bolivia, Paraguay, and Uruguay. Biological traits including average lifespan, body dimensions, and specific dietary composition remain poorly documented in the scientific literature, though Thylamys species are generally considered omnivorous, often consuming insects, small vertebrates, and plant material.