Common Fat-tailed Mouse Opossum vs Lowland Tapir

Thylamys pusillus compared with Tapirus terrestris

Key Differences

• Common Fat-tailed Mouse Opossum is Least Concern while Lowland Tapir is Vulnerable.

Taxonomic Classification

Rank	Common Fat-tailed Mouse Opossum	Lowland Tapir
Kingdom same	Animalia (животные)	Animalia (животные)
Phylum same	Chordata (хордовые)	Chordata (хордовые)
Class same	Mammalia (млекопитающие)	Mammalia (млекопитающие)
Order	Didelphimorphia (Опоссумы)	Perissodactyla (непарнокопытные)
Family	Didelphidae	Tapiridae
Genus	Thylamys	Tapirus
Species	Thylamys pusillus	Tapirus terrestris

Evolutionary Relationship

Common Fat-tailed Mouse Opossum and Lowland Tapir share a common ancestor at the Class level: Mammalia. (млекопитающие)

Conservation Status

Common Fat-tailed Mouse Opossum

LC — Least Concern

Lowland Tapir

VU — Vulnerable

Physical Characteristics

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

Habitat & Geographic Range

Common Fat-tailed Mouse Opossum

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

Lowland Tapir

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

Range

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

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.