Eurasian otter — Lutra lutra

Overview

The Eurasian otter, Welsh Dyfrgi, is a semiaquatic carnivore of rivers, lakes and coasts. Coastal otters need fresh water for bathing and land holts for resting and breeding. Inland habitat combines food with vegetated banks, islands, reedbeds and woodland.

JNCC site accounts record otters through much of the Welsh Afon Teifi catchment. At Cors Caron, amphibians are spring prey for breeding otters, and the River Wye provides bank cover, food and breeding scrub. JNCC's European account identifies strong populations in Greece. Declines have been linked to pollution, hunting and habitat loss, and toxic organochlorines contributed in Britain. Those trend accounts are undated, so no current population is given.

The Natural History Museum's species dictionary accepts Lutra lutra (Linnaeus, 1758); the authority dates the name, not the species' origin. A genomic repository lineage places it in Carnivora, Mustelidae, Lutrinae and Lutra. Lutra felina is a synonym of Lontra felina and is not this species.

Origins & earliest records

A living species; its 1758 authority is nomenclatural only.

Evidence & interpretation

Conservation site accounts, museum nomenclature and a genomic repository lineage.

Selected bibliography

Documented works and useful reading. This is not a list of every appearance.

1. 01

   Otter (Lutra lutra)

   JNCC · n.d.

   Selected bibliography; ecology, European distribution and named site accounts read.

2. 02

   Species Dictionary: Lutra lutra (Linnaeus, 1758)

   Natural History Museum · n.d.

   Selected bibliography; accepted name, authority and common names only.

3. 03

   Lutra lutra BioProject 824496

   NCBI · n.d.

   Selected bibliography; organism lineage only.

Family, evolution & connections

Taxonomic classification

A hierarchy of classified groups, not a chain of direct ancestors.

Source note: The cited genomic lineage groups this species in Carnivora, Mustelidae, Lutrinae and Lutra.

1. familyMustelidae
2. subfamilyLutrinae
3. genusLutra

References

Sources supporting this profile. Linked pages have their own scope and editorial standards.

1. governmentOtter (Lutra lutra)Research access: 2026-10-06
2. museumSpecies Dictionary: Lutra lutra (Linnaeus, 1758)Research access: 2026-10-06
3. repositoryLutra lutra BioProject 824496Research access: 2026-10-06

Image credits

A black silhouette of a swimming otter with its head raised, legs held close and long tapering tail curved upwards.

Attributed silhouette labelled Lutra lutra in the individual source record; retained whole raster shows an outline, without colour, exact locality or diagnostic detail.