Common Fat-tailed Mouse Opossum vs Veiled Chameleon

Thylamys pusillus compared with Chamaeleo calyptratus

Taxonomic Classification

Rank	Common Fat-tailed Mouse Opossum	Veiled Chameleon
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Chordata (Chordates)	Chordata (Chordates)
Class	Mammalia (Mammals)	Reptilia (Reptiles)
Order	Didelphimorphia (Didelphimorphia)	Squamata (Lizards & Snakes)
Family	Didelphidae	Chamaeleonidae (Chameleons)
Genus	Thylamys	Chamaeleo (Chameleons)
Species	Thylamys pusillus	Chamaeleo calyptratus

Evolutionary Relationship

Common Fat-tailed Mouse Opossum and Veiled Chameleon share a common ancestor at the Phylum level: Chordata. (Chordates)

Conservation Status

Common Fat-tailed Mouse Opossum

LC — Least Concern

Veiled Chameleon

LC — Least Concern

Trend: Stable →

Physical Characteristics

Attribute	Common Fat-tailed Mouse Opossum	Veiled Chameleon
Diet	—	Omnivore
Average Lifespan	—	5 years
Average Length	—	50 cm
Average Weight	—	200 g

Habitat & Geographic Range

Common Fat-tailed Mouse Opossum

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

Veiled Chameleon

Habitat

Typically found in a wide range of habitat types.

Range

Distributed across Saudi Arabia and Yemen.

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.

Veiled Chameleon

The veiled chameleon is a large chameleon species native to Yemen and Saudi Arabia. They are popular as exotic pets.