Common Fat-tailed Mouse Opossum vs Komodo Dragon

Thylamys pusillus compared with Varanus komodoensis

Key Differences

• Common Fat-tailed Mouse Opossum is Least Concern while Komodo Dragon is Endangered.

Taxonomic Classification

Rank	Common Fat-tailed Mouse Opossum	Komodo Dragon
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	Mammalia (哺乳動物)	Reptilia (爬行纲)
Order	Didelphimorphia (负鼠目)	Squamata (有鱗目)
Family	Didelphidae	Varanidae (Monitor Lizards)
Genus	Thylamys	Varanus (Monitor Lizards)
Species	Thylamys pusillus	Varanus komodoensis

Evolutionary Relationship

Common Fat-tailed Mouse Opossum and Komodo Dragon share a common ancestor at the Phylum level: Chordata. (脊索动物门)

Conservation Status

Common Fat-tailed Mouse Opossum

LC — Least Concern

Komodo Dragon

EN — Endangered

Population: ~3.5K

Trend: Stable →

Physical Characteristics

Attribute	Common Fat-tailed Mouse Opossum	Komodo Dragon
Diet	—	Carnivore
Average Lifespan	—	30 years
Average Length	—	2.6 m
Average Weight	—	70.0 kg

Habitat & Geographic Range

Common Fat-tailed Mouse Opossum

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

Komodo Dragon

Habitat

Found across multiple habitat types including tropical and subtropical moist broadleaf forests, tropical and subtropical dry broadleaf forests, and tropical and subtropical grasslands and savannas, among 4 distinct biome types spanning the Australasia and Indomalayan realms. Populations are also found in montane and highland environments at higher elevations.

Range

Found in Indonesia. Currently classified as Endangered 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.

Komodo Dragon

科莫多巨蜥（Varanus komodoensis）是现存最大的蜥蜴，仅分布于印度尼西亚的少数岛屿。