European otter vs Ray

Lutra lutra compared with Atlantoraja castelnaui

Key Differences

• European otter is Vulnerable while Ray is Critically Endangered.

Taxonomic Classification

Rank	European otter	Ray
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Chordata (Chordates)	Chordata (Chordates)
Class	Mammalia (Mammals)	Elasmobranchii
Order	Carnivora (Carnivorans)	Rajiformes (Rajiformes)
Family	Mustelidae (Weasels & Otters)	Arhynchobatidae
Genus	Lutra (Otters)	Atlantoraja
Species	Lutra lutra	Atlantoraja castelnaui

Evolutionary Relationship

European otter and Ray share a common ancestor at the Phylum level: Chordata. (Chordates)

Conservation Status

European otter

VU — Vulnerable

Trend: Stable →

Ray

CR — Critically Endangered

Physical Characteristics

Attribute	European otter	Ray
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.

Ray

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.