Dwarf round ray vs koala

Urotrygon nana compared with Phascolarctos cinereus

Key Differences

• Dwarf round ray is Near Threatened while koala is Vulnerable.

Taxonomic Classification

Rank	Dwarf round ray	koala
Kingdom same	Animalia (動物)	Animalia (動物)
Phylum same	Chordata (脊索動物)	Chordata (脊索動物)
Class	Elasmobranchii	Mammalia (哺乳類)
Order	Myliobatiformes (トビエイ目)	Diprotodontia (カンガルー目)
Family	Urotrygonidae	Phascolarctidae (Koalas)
Genus	Urotrygon	Phascolarctos (Koalas)
Species	Urotrygon nana	Phascolarctos cinereus

Evolutionary Relationship

Dwarf round ray and koala share a common ancestor at the Phylum level: Chordata. (脊索動物)

Conservation Status

Dwarf round ray

NT — Near Threatened

koala

VU — Vulnerable

Population: ~100.0K

Trend: Decreasing ↓

Physical Characteristics

Attribute	Dwarf round ray	koala
Diet	—	Herbivore
Average Lifespan	—	15 years
Average Length	—	75 cm
Average Weight	—	10.0 kg

Habitat & Geographic Range

Dwarf round ray

koala

Habitat

Typically found in grasslands, forests, and vegetated habitats.

Range

Found in Australia. Currently classified as Vulnerable on the IUCN Red List, this species faces significant conservation challenges across its range.

koala

オーストラリア東部・南東部を代表する有袋類で、体重は最大15kgに達し、低カロリーのユーカリの葉食から得るエネルギーを節約するために1日最大22時間を睡眠に費やす。他の哺乳類の多くを死に至らしめる有毒なユーカリ成分を処理するために高度に特化しており、解毒に特別に適応した腸内微生物叢を持つ。クラミジア感染症、生息地の伐採、気候変動により個体数が激減し、2022年に絶滅危惧種に指定された。