European otter vs Harmless Serotine

Lutra lutra compared with Eptesicus innoxius

Key Differences

• European otter is Vulnerable while Harmless Serotine is Near Threatened.

Taxonomic Classification

Rank	European otter	Harmless Serotine
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Chordata (Chordates)	Chordata (Chordates)
Class same	Mammalia (Mammals)	Mammalia (Mammals)
Order	Carnivora (Carnivorans)	Chiroptera (Bats)
Family	Mustelidae (Weasels & Otters)	Vespertilionidae
Genus	Lutra (Otters)	Eptesicus
Species	Lutra lutra	Eptesicus innoxius

Evolutionary Relationship

European otter and Harmless Serotine share a common ancestor at the Class level: Mammalia. (Mammals)

Conservation Status

European otter

VU — Vulnerable

Trend: Stable →

Harmless Serotine

NT — Near Threatened

Physical Characteristics

Attribute	European otter	Harmless Serotine
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.

Harmless Serotine

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

Range

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

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.