Oso Polar vs Thick Shelled River Mussel

Ursus maritimus compared with Unio crassus

Key Differences

Oso Polar is Vulnerable while Thick Shelled River Mussel is Endangered.

Taxonomic Classification

Rank	Oso Polar	Thick Shelled River Mussel
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum	Chordata (cordados)	Mollusca (moluscos)
Class	Mammalia (mamíferos)	Bivalvia (Bivalvia)
Order	Carnivora (carnívoros)	Unionida (Unionida)
Family	Ursidae (Bears)	Unionidae
Genus	Ursus (Bears)	Unio
Species	Ursus maritimus	Unio crassus

Evolutionary Relationship

Oso Polar and Thick Shelled River Mussel share a common ancestor at the Kingdom level: Animalia. (Animals)

Vista Kingdom: Animalia

Conservation Status

Oso Polar

VU — Vulnerable

Population: ~26.0K

Trend: Decreasing ↓

Thick Shelled River Mussel

EN — Endangered

Physical Characteristics

Attribute	Oso Polar	Thick Shelled River Mussel
Diet	Carnivore	—
Average Lifespan	25 years	—
Average Length	2.4 m	—
Average Weight	450.0 kg	—

Habitat & Geographic Range

Oso Polar

Habitat

Found across multiple habitat types including temperate broadleaf and mixed forests, temperate coniferous forests, and boreal forests and taiga, among 4 distinct biome types within the Palearctic biogeographic realm. Populations are also found in montane and highland environments at higher elevations.

Range

Found in Norway. Currently classified as Vulnerable on the IUCN Red List, this species faces significant conservation challenges across its range.

Thick Shelled River Mussel

Habitat

Native to Europe, inhabiting ecosystems characteristic of the region.

Range

Distributed across Belgium, Denmark, Norway, Sweden, and Ukraine. Currently classified as Endangered on the IUCN Red List, this species faces significant conservation challenges across its range.

Oso Polar

El mayor carnivoro terrestre de la Tierra, el oso polar puede superar los 700 kg y se encuentra en el hielo marino del Artico, desde Canada hasta Rusia. Es un mamifero marino altamente especializado que depende del hielo marino para cazar focas anilladas y barbadas. Excelente nadador capaz de cubrir grandes distancias en agua abierta. Clasificado como Vulnerable, sus poblaciones soportan una presion severa por la rapida perdida de hielo marino artico debida al cambio climatico.