brown bear vs Leatherback Sea Turtle

Ursus arctos compared with Dermochelys coriacea

Key Differences

• brown bear is Extinct while Leatherback Sea Turtle is Vulnerable.
• brown bear is omnivore while Leatherback Sea Turtle is carnivore.
• Leatherback Sea Turtle is 1.7x heavier than brown bear.
• Leatherback Sea Turtle lives longer (50 years vs 25 years).

Taxonomic Classification

Rank	brown bear	Leatherback Sea Turtle
Kingdom same	Animalia (สัตว์)	Animalia (สัตว์)
Phylum same	Chordata (สัตว์มีแกนสันหลัง)	Chordata (สัตว์มีแกนสันหลัง)
Class	Mammalia (สัตว์เลี้ยงลูกด้วยน้ำนม)	Reptilia (สัตว์เลื้อยคลาน)
Order	Carnivora (สัตว์กินเนื้อ)	Testudines (เต่า)
Family	Ursidae (Bears)	Cheloniidae (Sea Turtles)
Genus	Ursus (Bears)	Chelonia (Green Sea Turtles)
Species	Ursus arctos	Dermochelys coriacea

Evolutionary Relationship

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

Conservation Status

brown bear

EX — Extinct

Population: ~200.0K

Trend: Stable →

Leatherback Sea Turtle

VU — Vulnerable

Population: ~35.0K

Trend: Decreasing ↓

Physical Characteristics

Attribute	brown bear	Leatherback Sea Turtle
Diet	Omnivore	Carnivore
Average Lifespan	25 years	50 years
Average Length	2.0 m	2.0 m
Average Weight	300.0 kg	500.0 kg

Habitat & Geographic Range

brown bear

Habitat

Typically found in a wide range of habitat types.

Range

Found across Europe (6 countries).

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.

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.

Leatherback Sea Turtle

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