brown bear vs koala

Ursus arctos compared with Phascolarctos cinereus

Key Differences

brown bear is Extinct while koala is Vulnerable.
brown bear is omnivore while koala is herbivore.
brown bear is 30.0x heavier than koala.
brown bear lives longer (25 years vs 15 years).

Taxonomic Classification

Rank	brown bear	koala
Kingdom same	Animalia (hayvan)	Animalia (hayvan)
Phylum same	Chordata (Kordalılar)	Chordata (Kordalılar)
Class same	Mammalia (memeliler)	Mammalia (memeliler)
Order	Carnivora (etçiller)	Diprotodontia (İki ön dişliler)
Family	Ursidae (Bears)	Phascolarctidae (Koalas)
Genus	Ursus (Bears)	Phascolarctos (Koalas)
Species	Ursus arctos	Phascolarctos cinereus

Evolutionary Relationship

brown bear and koala share a common ancestor at the Class level: Mammalia. (memeliler)

Göster Class: Mammalia

Conservation Status

brown bear

EX — Extinct

Population: ~200.0K

Trend: Stable →

koala

VU — Vulnerable

Population: ~100.0K

Trend: Decreasing ↓

Physical Characteristics

Attribute	brown bear	koala
Diet	Omnivore	Herbivore
Average Lifespan	25 years	15 years
Average Length	2.0 m	75 cm
Average Weight	300.0 kg	10.0 kg

Habitat & Geographic Range

brown bear

Habitat

Typically found in a wide range of habitat types.

Range

Found across Europe (6 countries).

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.

brown bear

The world's most widely distributed bear species, brown bears range from North America and Europe across Russia to Japan, occupying forests, tundra, and alpine meadows. Adults can weigh up to 700 kg in coastal Alaskan populations. Omnivores that consume berries, roots, fish, and carrion, brown bears are a keystone species that distribute nutrients across landscapes. Most populations are stable, though some subspecies are threatened.

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.