European otter vs tree hydroid

Lutra lutra compared with Eudendrium ramosum

Key Differences

• European otter is Vulnerable while tree hydroid is Not Evaluated.

Taxonomic Classification

Rank	European otter	tree hydroid
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum	Chordata (Chordates)	Cnidaria (Cnidarians)
Class	Mammalia (Mammals)	Hydrozoa (Hydrozoa)
Order	Carnivora (Carnivorans)	Anthoathecata (Anthoathecata)
Family	Mustelidae (Weasels & Otters)	Eudendriidae
Genus	Lutra (Otters)	Eudendrium
Species	Lutra lutra	Eudendrium ramosum

Evolutionary Relationship

European otter and tree hydroid share a common ancestor at the Kingdom level: Animalia. (Animals)

Conservation Status

European otter

VU — Vulnerable

Trend: Stable →

tree hydroid

NE — Not Evaluated

Physical Characteristics

Attribute	European otter	tree hydroid
Diet	Carnivore	—
Average Lifespan	10 years	—
Average Length	1.0 m	—
Average Weight	10.0 kg	—

Habitat & Geographic Range

European otter

Habitat

Typically found in diverse ecosystems where prey species are available.

Range

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

tree hydroid

Habitat

Native to Europe, inhabiting ecosystems characteristic of the region.

Range

Distributed across Denmark, Norway, and Sweden.

European otter

Sleek semi-aquatic mustelid found along clean rivers, streams, and coastlines across Europe and Asia. European otters can reach 1.3 meters in length and are highly skilled fish hunters, using sensitive whiskers to detect prey movements. Requiring unpolluted water with abundant fish, they are an indicator species for freshwater ecosystem health. Once nearly extinct in Western Europe from hunting and pollution, populations have recovered significantly following water quality improvements.

Shared Countries

Both species can be found in 3 countries:

🇩🇰 Denmark 🇳🇴 Norway 🇸🇪 Sweden