Eurasian beaver vs massive horny sponge

Castor fiber compared with Polymastia boletiformis

Key Differences

• Eurasian beaver is Vulnerable while massive horny sponge is Not Evaluated.

Taxonomic Classification

Rank	Eurasian beaver	massive horny sponge
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum	Chordata (Chordates)	Porifera (Sponges)
Class	Mammalia (Mammals)	Demospongiae (Demospongiae)
Order	Rodentia (Rodents)	Polymastiida (Polymastiida)
Family	Castoridae (Beavers)	Polymastiidae
Genus	Castor (Beavers)	Polymastia
Species	Castor fiber	Polymastia boletiformis

Evolutionary Relationship

Eurasian beaver and massive horny sponge share a common ancestor at the Kingdom level: Animalia. (Animals)

Conservation Status

Eurasian beaver

VU — Vulnerable

massive horny sponge

NE — Not Evaluated

Physical Characteristics

Attribute	Eurasian beaver	massive horny sponge
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.

massive horny sponge

Habitat

Native to Europe, inhabiting ecosystems characteristic of the region.

Range

Distributed across Denmark, Norway, and Sweden.

Eurasian beaver

Eurasian beaver (Castor fiber) is classified as Vulnerable (VU) on the IUCN Red List. Facing a high risk of endangerment in the wild, with declining populations and increasing habitat pressure.

Shared Countries

Both species can be found in 3 countries:

🇩🇰 Denmark 🇳🇴 Norway 🇸🇪 Sweden