koala vs Santa Cruz Nesoryzomys

Phascolarctos cinereus compared with Nesoryzomys indefessus

Key Differences

• koala is Vulnerable while Santa Cruz Nesoryzomys is Extinct.

Taxonomic Classification

Rank	koala	Santa Cruz Nesoryzomys
Kingdom same	Animalia (животные)	Animalia (животные)
Phylum same	Chordata (хордовые)	Chordata (хордовые)
Class same	Mammalia (млекопитающие)	Mammalia (млекопитающие)
Order	Diprotodontia (двурезцовые сумчатые)	Rodentia (грызуны)
Family	Phascolarctidae (Koalas)	Cricetidae
Genus	Phascolarctos (Koalas)	Nesoryzomys
Species	Phascolarctos cinereus	Nesoryzomys indefessus

Evolutionary Relationship

koala and Santa Cruz Nesoryzomys share a common ancestor at the Class level: Mammalia. (млекопитающие)

Conservation Status

koala

VU — Vulnerable

Population: ~100.0K

Trend: Decreasing ↓

Santa Cruz Nesoryzomys

EX — Extinct

Physical Characteristics

Attribute	koala	Santa Cruz Nesoryzomys
Diet	Herbivore	—
Average Lifespan	15 years	—
Average Length	75 cm	—
Average Weight	10.0 kg	—

Habitat & Geographic Range

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.

Santa Cruz Nesoryzomys

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

Range

Found in Ecuador.

koala

Iconic marsupial of eastern and southeastern Australia, koalas weigh up to 15 kg and spend up to 22 hours daily sleeping to conserve energy from their low-calorie eucalyptus leaf diet. Highly specialized to process toxic eucalyptus compounds that would kill most other mammals, they have gut microbiomes uniquely adapted for detoxification. Listed as Endangered in 2022, with populations decimated by chlamydia disease, habitat clearing, and climate change.