Common Fat-tailed Mouse Opossum vs Pine Bonnet

Thylamys pusillus compared with Mycena silvae-nigrae

Key Differences

• Common Fat-tailed Mouse Opossum is Least Concern while Pine Bonnet is Data Deficient.

Taxonomic Classification

Rank	Common Fat-tailed Mouse Opossum	Pine Bonnet
Kingdom	Animalia (Animals)	Fungi (Fungi)
Phylum	Chordata (Chordates)	Basidiomycota (Club Fungi)
Class	Mammalia (Mammals)	Agaricomycetes (Mushrooms)
Order	Didelphimorphia (Didelphimorphia)	Agaricales (Gilled Mushrooms)
Family	Didelphidae	Mycenaceae
Genus	Thylamys	Mycena
Species	Thylamys pusillus	Mycena silvae-nigrae

Conservation Status

Common Fat-tailed Mouse Opossum

LC — Least Concern

Pine Bonnet

DD — Data Deficient

Physical Characteristics

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

Habitat & Geographic Range

Common Fat-tailed Mouse Opossum

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

Pine Bonnet

Habitat

Typically found in forest floors, decomposing wood, and soil ecosystems.

Range

Distributed across Denmark, Norway, and Sweden.

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.