---
title: "Eurasian Otter (Lutra lutra) | AnimalTracks.wiki"
description: "Whiskers that sense a fish moving through the water, a scent-marked calling card called a spraint, and a river range that stretches from Britain to Japan."
image: "https://animaltracks.wiki/images/animals/eurasian-otter-1.webp"
published: "2026-09-01"
updated: "2026-09-27"
---
# Eurasian Otter (*Lutra lutra*)
> **Status**: Checked against 12 sources, listed under Sources below.
> **Tagline**: Whiskers that sense a fish moving through the water, a scent-marked calling card called a spraint, and a river range that stretches from Britain to Japan.
> **Soundtrack Vibe**: Pastoral Folk & Progressive Bluegrass // Fairport Convention, "Dirty Linen"
> **Soundtrack Links**: [Spotify](https://open.spotify.com/track/1lacwYVHwgm7vtIFznkbVp) | [YouTube](https://www.youtube.com/watch?v=MUtKS4BIePs)
> **Vibe Match**: Driving acoustic fiddle reels with no words, for an otter whose voice is short, shrill whistles and yelps: alarm, greeting and mating calls plus up to 12 others.
## Biological Superpowers & Stats
- **Taxonomy**: *Lutra lutra*
- **Danger Level**: Low
- **Conservation Status**: Near Threatened ([IUCN Red List](https://doi.org/10.2305/iucn.uk.2025-1.rlts.t12419a227078232.en))
- **Superpower**: Vibrissae, whiskers above its lips, that detect changes in the water current and track the movements of fish and other prey underwater.
- **Habitat**: Rivers, lakes, coastal fjords, peat swamps and rice paddies across Europe, North Africa and Asia, as far as Japan and Indonesia
- **Diet**: Fish, crustaceans, amphibians, small mammals, birds, eggs, insects and worms
- **Tags**: mustelid, freshwater, wetlands, carnivore
## Natural History & Behavior
## The World's Most Widespread Otter
The Eurasian otter (*Lutra lutra*) is the most widely distributed otter species, found across Europe, North Africa and Asia as far as Japan and Indonesia. In the UK, otters weigh 7 to 11 kilograms and measure 94 to 155 centimetres from nose to tail, and males are larger on average. The longevity record in captivity belongs to a female who lived to 18.2 years old. Rivers, lakes, coastal fjords, peat swamps and rice paddies count as home. In a territory of 1 to 4 miles, each otter keeps fixed places for getting in and out of the water, rolling, sunbathing and sliding down "otter stairways".
## Whiskers That Hunt in the Dark
Its vibrissae, whiskers above its lips, detect changes in the water current and the presence of prey, and track the movements of fish underwater. It can dive for up to two minutes and is most active at dusk and during the night. Its catch list is long: fish, crustaceans, amphibians, small mammals, birds, eggs, insects and worms, about a kilogram of food a day.
The mix shifts with season and place. On five woodland rivers in eastern Poland, fish made up 51% of what otters ate by weight in spring and summer but 40% in autumn and winter, when amphibians rose to 58%. A review of 37 European diet studies found that otters in Mediterranean areas relied less on fish, and more on aquatic invertebrates and reptiles, than otters in temperate areas.
## A Smell Left as a Signature
Eurasian otters are basically solitary. Mates pair only briefly and mothers keep their young with them for a time, though loose groups of up to six sometimes turn up. They are vocal too, with basic calls for alarm, greeting and mating plus up to 12 others, from shrill whistles and yelps to high-pitched screams of distress.
> **Spraint** is the name for otter droppings, left on rocks and logs close to the water as a way of communicating with other otters. Along 28 kilometres of the River San in south-eastern Poland, a three-week survey of both banks counted an average of 4.18 new spraints per kilometre per day, and the more of a stretch's banks were steep and rocky, the more spraints it collected.
Paired scent glands at the base of the tail give off a heavy, musky smell, and scent marks carry news of territory boundaries, identity and sexual state. Eurasian otter males form a dominance hierarchy, and the highest-ranking ones hold, and mark, the best ranges.
## Poisons and a Comeback
A 1998 study named PCBs, industrial chemicals, as one of the major factors in the otter's serious decline over the previous decades. Rat poison turns up too: in mustelids collected in south-western France from 1990 to 2002, the rodenticide bromadiolone was found in the livers of two of eleven otters.
The Woodland Trust calls the otter's return across the UK a conservation success story: by the 1950s, hunting, habitat destruction and chemicals in rivers had left it on the brink of extinction there. In one area of southern England, otters and polecats were absent in the 1990s but back by the 2000s, and a 2009 study found the invasive American mink there had switched from mostly nocturnal to mostly daytime activity, which the researchers suggest may help it avoid them. The IUCN Red List classes the Eurasian otter as Near Threatened.
## Frequently Asked Questions
### How does a Eurasian otter find fish underwater?
With its whiskers. The vibrissae work as sensing organs underwater, picking up the movements of fish and other prey. An otter hunts and feeds several times a day and gets through about a kilogram of food daily. *(Source: [Animal Diversity Web, University of Michigan]())*
### What happens if you take away an otter's spraints?
The otters make up for it. On 28 km of the River San in south-eastern Poland, researchers cleared old spraints from 14 stretches of river. In the first week, sprainting on those stretches rose 1.6-fold, while on 14 untouched stretches it fell 1.5-fold. Adding spraints from unfamiliar otters made no further difference. *(Source: [Brzeziński & Romanowski 2006]())*
### Does a Eurasian otter eat the same things all year round?
No. In north-east Scotland in 1987, the share of amphibians in otter droppings varied with the season and the habitat, rising in late winter and spring while the amphibians were hibernating or spawning, and it tracked how many amphibians were available. Common frogs made up 60.8% of the amphibian prey, common toads only 1.7%. *(Source: [Weber 1990]())*
### What did PCB pollution do to Eurasian otters?
A 1998 study counted PCBs among the major factors in the otter's serious decline. In wild otters, the more PCB a liver held, the less vitamin A it stored, and that went with more infectious disease. *(Source: [Murk et al. 1998]())*
## Sources
1. [Lutra lutra (European otter). Animal Diversity Web, University of Michigan.]()
2. [Otter. San Diego Zoo Wildlife Alliance.]()
3. [AnAge entry for Lutra lutra. AnAge: The Animal Ageing and Longevity Database, Human Ageing Genomic Resources.]()
4. [Otter (Lutra lutra). Woodland Trust.]()
5. [Loy (2025). Lutra lutra. The IUCN Red List of Threatened Species 2025: e.T12419A227078232.]()
6. [Jędrzejewska et al. (2001). Feeding habits of the otter and the American mink in Białowieża Primeval Forest (Poland) compared to other Eurasian populations. Ecography.]()
7. [Weber (1990). Seasonal exploitation of amphibians by otters (Lutra lutra) in north-east Scotland. Journal of Zoology.]()
8. [Clavero, Prenda & Delibes (2003). Trophic diversity of the otter (Lutra lutra L.) in temperate and Mediterranean freshwater habitats. Journal of Biogeography.]()
9. [Brzeziński & Romanowski (2006). Experiments on sprainting activity of otters (Lutra lutra) in the Bieszczady Mountains, southeastern Poland. Mammalia.]()
10. [Murk et al. (1998). Application of biomarkers for exposure and effect of polyhalogenated aromatic hydrocarbons in naturally exposed European otters (Lutra lutra). Environmental Toxicology and Pharmacology.]()
11. [Fournier-Chambrillon et al. (2004). Evidence of secondary poisoning of free-ranging riparian mustelids by anticoagulant rodenticides in France: implications for conservation of European mink (Mustela lutreola). Journal of Wildlife Diseases.]()
12. [Harrington et al. (2009). The impact of native competitors on an alien invasive: temporal niche shifts to avoid interspecific aggression. Ecology.]()
*Published September 1, 2026. Last updated September 27, 2026.*
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