European otter vs Williamson's Mouse-deer

Lutra lutra compared with Tragulus williamsoni

Key Differences

• European otter is Vulnerable while Williamson's Mouse-deer is Data Deficient.

Taxonomic Classification

Rank	European otter	Williamson's Mouse-deer
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Chordata (Chordates)	Chordata (Chordates)
Class same	Mammalia (Mammals)	Mammalia (Mammals)
Order	Carnivora (Carnivorans)	Artiodactyla (Even-toed Ungulates)
Family	Mustelidae (Weasels & Otters)	Tragulidae
Genus	Lutra (Otters)	Tragulus
Species	Lutra lutra	Tragulus williamsoni

Evolutionary Relationship

European otter and Williamson's Mouse-deer share a common ancestor at the Class level: Mammalia. (Mammals)

Conservation Status

European otter

VU — Vulnerable

Trend: Stable →

Williamson's Mouse-deer

DD — Data Deficient

Physical Characteristics

Attribute	European otter	Williamson's Mouse-deer
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.

Williamson's Mouse-deer

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

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.