koala vs Spiny naiad

Phascolarctos cinereus compared with Najas marina

Key Differences

• koala is Vulnerable while Spiny naiad is Endangered.

Taxonomic Classification

Rank	koala	Spiny naiad
Kingdom	Animalia (حيوانات)	Plantae (نباتات)
Phylum	Chordata (حبليات)	Magnoliophyta (كاسيات البذور)
Class	Mammalia (ثدييات)	Liliopsida (زنبقانية)
Order	Diprotodontia (ثنائيات الأسنان الأمامية)	Alismatales (مزماريات)
Family	Phascolarctidae (Koalas)	Hydrocharitaceae
Genus	Phascolarctos (Koalas)	Najas
Species	Phascolarctos cinereus	Najas marina

Conservation Status

koala

VU — Vulnerable

Population: ~100.0K

Trend: Decreasing ↓

Spiny naiad

EN — Endangered

Physical Characteristics

Attribute	koala	Spiny naiad
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.

Spiny naiad

Habitat

Found across multiple habitat types including tropical and subtropical moist broadleaf forests, tropical and subtropical dry broadleaf forests, and deserts and xeric shrublands, among 5 distinct biome types spanning the Indomalayan and Neotropic realms. Populations are also found in montane and highland environments at higher elevations.

Range

Widely distributed across Asia (Sri Lanka, Taiwan), Europe (5 countries), North America (6 countries), and South America (Brazil). Currently classified as Endangered on the IUCN Red List, this species faces significant conservation challenges across its range.

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.