Eurasian beaver vs Amerika-aka-ei

Castor fiber compared with Hypanus americanus

Key Differences

• Eurasian beaver is Vulnerable while Amerika-aka-ei is Near Threatened.

Taxonomic Classification

Rank	Eurasian beaver	Amerika-aka-ei
Kingdom same	Animalia (動物)	Animalia (動物)
Phylum same	Chordata (脊索動物)	Chordata (脊索動物)
Class	Mammalia (哺乳類)	Elasmobranchii
Order	Rodentia (ネズミ目)	Myliobatiformes (トビエイ目)
Family	Castoridae (Beavers)	Dasyatidae
Genus	Castor (Beavers)	Hypanus
Species	Castor fiber	Hypanus americanus

Evolutionary Relationship

Eurasian beaver and Amerika-aka-ei share a common ancestor at the Phylum level: Chordata. (脊索動物)

Conservation Status

Eurasian beaver

VU — Vulnerable

Amerika-aka-ei

NT — Near Threatened

Physical Characteristics

Attribute	Eurasian beaver	Amerika-aka-ei
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Eurasian beaver

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

Range

Found across Europe (6 countries). Currently classified as Vulnerable on the IUCN Red List, this species faces significant conservation challenges across its range.

Amerika-aka-ei

Habitat

Native to South America, inhabiting ecosystems characteristic of the region.

Range

Found in Venezuela. Listed as Near Threatened, this species requires ongoing monitoring to prevent population decline.

Eurasian beaver

ユーラシアビーバー（Castor fiber）はIUCNレッドリストで絶滅危惧II類（VU）に分類されています。個体群の減少と生息地への圧力の増大により、野生での絶滅危険度が高い状況に直面しています。