Common Fat-tailed Mouse Opossum vs Javan Mongoose

Thylamys pusillus compared with Herpestes javanicus

Key Differences

• Common Fat-tailed Mouse Opossum is Least Concern while Javan Mongoose is Not Evaluated.

Taxonomic Classification

Rank	Common Fat-tailed Mouse Opossum	Javan Mongoose
Kingdom same	Animalia (动物界)	Animalia (动物界)
Phylum same	Chordata (脊索动物门)	Chordata (脊索动物门)
Class same	Mammalia (哺乳動物)	Mammalia (哺乳動物)
Order	Didelphimorphia (负鼠目)	Carnivora (食肉目)
Family	Didelphidae	Herpestidae
Genus	Thylamys	Herpestes
Species	Thylamys pusillus	Herpestes javanicus

Evolutionary Relationship

Common Fat-tailed Mouse Opossum and Javan Mongoose share a common ancestor at the Class level: Mammalia. (哺乳動物)

Conservation Status

Common Fat-tailed Mouse Opossum

LC — Least Concern

Javan Mongoose

NE — Not Evaluated

Physical Characteristics

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

Habitat & Geographic Range

Common Fat-tailed Mouse Opossum

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

Javan Mongoose

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

Range

Widely distributed across Africa (Comoros, Mauritius), Asia (Japan), Europe (4 countries), North America (11 countries), Oceania and the Pacific (Fiji, Micronesia), and South America (Colombia, Guyana).

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.