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Eurasian Water Shrew
Mammals diurnal

Eurasian Water Shrew

Neomys fodiens

Meet the tiny diver of the stream bank. The Eurasian Water Shrew is a venomous, semi-aquatic marvel that uses its specialized 'paddle-feet' to hunt underwater while its velvet fur keeps it bone-dry.

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Quick Identification

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Size

Head and body length 6-10 cm (2.4-4 in); tail length 4-8 cm (1.5-3 in); weight 8-25g (0.3-0.9 oz)

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Colors

Distinctive bi-colored coat with a velvety black or dark charcoal-grey back and a sharp transition to a silvery-white or greyish belly. Some individuals may have small white tufts behind the eyes or on the ears.

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Key Features

  • Velvety black back with a sharply defined white underside
  • Fringe of stiff silver hairs on the underside of the tail and feet acting as 'paddles'
  • Noticeably larger than common or pygmy shrews
  • Very small eyes and ears almost entirely hidden by thick fur

When You’ll See Them

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Activity pattern diurnal
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Peak hours Active in 3-hour cycles throughout the 24-hour period, with increased surface activity during twilight.
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Season Year-round, with peak visibility from April to September during the breeding season.
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Diet A carnivorous diet consisting of aquatic invertebrates (shrimp, water beetles), small fish, frogspawn, tadpoles, and terrestrial insects like earthworms and snails.
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Habitat Clean, fast-flowing streams, rivers, ponds, and occasionally damp terrestrial habitats like reed beds, watercress beds, or lush suburban gardens with ponds.

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Behavior

The Eurasian Water Shrew is a remarkably energetic mammal, living a fast-paced life driven by an incredibly high metabolic rate. Unlike most shrews, it is semi-aquatic, possessing specialized stiff hairs on its feet that act like oars. They are solitary and highly territorial, often engaging in frantic, high-pitched squeaking scuffles if they encounter another shrew. Though they spend much of their time in burrows near the water's edge, they are bold hunters that dive frequently, using their dense, air-trapping fur to stay buoyant and dry while submerged.

These shrews are among the few venomous mammals in the world. Their saliva contains a toxin that can paralyze small fish, frogs, and large insects, allowing them to subdue prey much larger than themselves. While they are generally shy around humans, they are often spotted by the distinctive 'plop' they make when diving or the 'V' shaped ripple they leave on the water's surface as they swim. They do not hibernate, meaning they must hunt relentlessly through the winter to maintain their body temperature, often foraging under ice.

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Camera Tips

To capture the Eurasian Water Shrew, camera placement is everything. Focus on 'pinch points' along the water’s edge where the land meets the stream or pond. Look for flat stones, low-hanging roots, or muddy banks with small, circular tunnel entrances about 2cm wide. Position your camera very low—no more than 5 to 10 inches off the ground—and angle it slightly downward to capture their scurrying movement. Because they are so small, a camera with a short focal length or a specialized 'macro' lens is ideal to prevent blurry images of these tiny subjects.

Since these shrews move with lightning speed, your camera settings are critical for success. Use a 'burst' or 'multi-shot' mode to catch them as they dart in and out of the water. If your camera allows for trigger speed adjustment, set it to the fastest possible setting (0.2 seconds or less). High-definition video at 60fps is often superior to still photos for this species, as it captures their frantic swimming and grooming behaviors which are easily missed in a single frame. Use high-sensitivity PIR (Passive Infrared) settings to ensure the sensor detects such a small heat signature.

Baiting is the most effective way to get a clear, focused shot rather than just a blur of black fur. Place a small amount of mealworms, dried river shrimp, or a tiny piece of wet cat food on a flat, dry rock within the camera's frame. This encourages the shrew to pause for a few seconds. If you are monitoring a garden pond, you can create a 'shrew run' using a section of 40mm drainage pipe leading to a sheltered feeding station; this guides them directly into the center of your lens's field of view.

While they are active year-round, the breeding season from April to August offers the best opportunities as they are more active and less cautious. During winter, they are harder to spot but will consistently frequent the same established runs. Always ensure your camera is waterproof and well-secured, as water levels can rise unexpectedly in their preferred habitats. Using an external battery pack is recommended for long-term monitoring, as the frequent triggers from flowing water or moving reeds can drain standard batteries quickly.

Similar Species

Species that look similar or are commonly confused with Eurasian Water Shrew.

Common Shrew

Smaller with a brown, tri-colored coat and lacking the specialized swimming hairs on the feet and tail.

Pygmy Shrew

Much smaller with a proportionally thicker tail and a more uniform light brown coloration.

Frequently Asked Questions

Unlike many small mammals, Eurasian Water Shrew are active both day and night. They typically follow a rhythm of short bursts of intense hunting (about 1-3 hours) followed by periods of rest in their burrows, making them visible at almost any time of day if you are patient.
If you have a pond or a nearby stream, you can attract them by maintaining clean, unpolluted water and leaving 'wild' corridors of long grass or log piles along the water's edge. Providing a small, consistent source of mealworms or dried shrimp on a flat stone near the water can also encourage regular visits.
They have a diverse diet including aquatic insects, crustaceans, and small fish. Remarkably, they use venomous saliva to paralyze larger prey like frogs and newts. On land, they will also hunt for earthworms and snails to fuel their high metabolism.
They are less common in urban centers but can be found in suburban gardens that feature ponds or border natural waterways. They require relatively clean water and plenty of ground cover, so a 'wilder' garden with native plants is more likely to host them.
The Eurasian Water Shrew is significantly larger and has a much darker, almost pitch-black back compared to the tri-colored brown coat of the Common Shrew. Look for the 'fringe' of silver hairs on their feet and the striking white belly, which is much cleaner than the Common Shrew's buff-colored underside.

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