Buff Button vs Common Fat-tailed Mouse Opossum

Acleris permutana compared with Thylamys pusillus

Key Differences

• Buff Button is Vulnerable while Common Fat-tailed Mouse Opossum is Least Concern.

Taxonomic Classification

Rank	Buff Button	Common Fat-tailed Mouse Opossum
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum	Arthropoda (Arthropods)	Chordata (Chordates)
Class	Insecta (Insects)	Mammalia (Mammals)
Order	Lepidoptera (Butterflies & Moths)	Didelphimorphia (Didelphimorphia)
Family	Tortricidae	Didelphidae
Genus	Acleris	Thylamys
Species	Acleris permutana	Thylamys pusillus

Evolutionary Relationship

Buff Button and Common Fat-tailed Mouse Opossum share a common ancestor at the Kingdom level: Animalia. (Animals)

Conservation Status

Buff Button

VU — Vulnerable

Common Fat-tailed Mouse Opossum

LC — Least Concern

Physical Characteristics

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

Habitat & Geographic Range

Buff Button

Habitat

Typically found in virtually all terrestrial and freshwater habitats.

Range

Distributed across Belgium, Denmark, and Sweden. Currently classified as Vulnerable on the IUCN Red List, this species faces significant conservation challenges across its range.

Common Fat-tailed Mouse Opossum

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

Buff Button

The Buff Button (Acleris permutana) is a species in the genus Acleris. It is currently classified as Vulnerable on the IUCN Red List. Typically found in virtually all terrestrial and freshwater habitats.

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.