ヒメハジロ vs Common Fat-tailed Mouse Opossum

Bucephala albeola compared with Thylamys pusillus

Key Differences

• ヒメハジロ is Not Evaluated while Common Fat-tailed Mouse Opossum is Least Concern.

Taxonomic Classification

Rank	ヒメハジロ	Common Fat-tailed Mouse Opossum
Kingdom same	Animalia (動物)	Animalia (動物)
Phylum same	Chordata (脊索動物)	Chordata (脊索動物)
Class	Aves (鳥類)	Mammalia (哺乳類)
Order	Anseriformes (カモ目)	Didelphimorphia (Didelphimorphia)
Family	Anatidae	Didelphidae
Genus	Bucephala	Thylamys
Species	Bucephala albeola	Thylamys pusillus

Evolutionary Relationship

ヒメハジロ and Common Fat-tailed Mouse Opossum share a common ancestor at the Phylum level: Chordata. (脊索動物)

Conservation Status

ヒメハジロ

NE — Not Evaluated

Common Fat-tailed Mouse Opossum

LC — Least Concern

Physical Characteristics

Attribute	ヒメハジロ	Common Fat-tailed Mouse Opossum
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

ヒメハジロ

Habitat

Typically found in various aerial, terrestrial, and aquatic environments.

Range

Found across Europe (11 countries) and North America (United States).

Common Fat-tailed Mouse Opossum

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

ヒメハジロ

バフルヘッド（Bucephala albeola）はIUCNレッドリストで未評価（NE）に分類されています。まだIUCNレッドリストの基準に照らした評価が行われておらず、保全状況は未確定です。

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.