koala vs Leatherback Sea Turtle

Phascolarctos cinereus compared with Dermochelys coriacea

Key Differences

• koala is herbivore while Leatherback Sea Turtle is carnivore.
• Leatherback Sea Turtle is 50.0x heavier than koala.
• Leatherback Sea Turtle lives longer (50 years vs 15 years).

Taxonomic Classification

Rank	koala	Leatherback Sea Turtle
Kingdom same	Animalia (สัตว์)	Animalia (สัตว์)
Phylum same	Chordata (สัตว์มีแกนสันหลัง)	Chordata (สัตว์มีแกนสันหลัง)
Class	Mammalia (สัตว์เลี้ยงลูกด้วยน้ำนม)	Reptilia (สัตว์เลื้อยคลาน)
Order	Diprotodontia (Marsupials)	Testudines (เต่า)
Family	Phascolarctidae (Koalas)	Cheloniidae (Sea Turtles)
Genus	Phascolarctos (Koalas)	Chelonia (Green Sea Turtles)
Species	Phascolarctos cinereus	Dermochelys coriacea

Evolutionary Relationship

koala and Leatherback Sea Turtle share a common ancestor at the Phylum level: Chordata. (สัตว์มีแกนสันหลัง)

Conservation Status

koala

VU — Vulnerable

Population: ~100.0K

Trend: Decreasing ↓

Leatherback Sea Turtle

VU — Vulnerable

Population: ~35.0K

Trend: Decreasing ↓

Physical Characteristics

Attribute	koala	Leatherback Sea Turtle
Diet	Herbivore	Carnivore
Average Lifespan	15 years	50 years
Average Length	75 cm	2.0 m
Average Weight	10.0 kg	500.0 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.

Leatherback Sea Turtle

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 5 distinct biome types spanning the Australasia and Indomalayan and Neotropic realms. Populations are also found in montane and highland environments at higher elevations.

Range

Distributed across Costa Rica, Indonesia, Malaysia, and Trinidad and Tobago. Currently classified as Vulnerable 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.

Leatherback Sea Turtle

The leatherback is the largest living turtle and the fourth-heaviest reptile. Unlike other turtles, it has a soft, leathery shell.