Mammals Active day and night

Mediterranean Water Shrew

Neomys milleri

iNaturalist Wikipedia

A pint-sized predator of the water's edge, the Mediterranean Water Shrew is a master of the damp shadows. With its velvet-black coat and silver belly, this energetic hunter brings high-speed drama to riverbanks and garden ponds across Europe.

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Quick Identification

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Size

Head and body length: 70–95 mm (2.8–3.7 in); Tail: 40–65 mm (1.6–2.6 in); Weight: 9–18 g (0.3–0.6 oz)

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Colors

Bicolored with velvety black or dark slate-gray upperparts and a sharply contrasting silvery-white or pale gray underside.

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Key Features

Distinct 'tide mark' separation between dark back and white belly
Red-tipped teeth characteristic of red-toothed shrews
Short, stiff hairs on the tail underside (less prominent than in Eurasian species)
Pointed, highly mobile snout with long tactile whiskers

When You’ll See Them

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Activity pattern Active day and night

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Peak hours Bursts of activity every 2-4 hours, 24/7

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Season Year-round

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Diet Primarily insectivorous, eating aquatic larvae, crustaceans, and earthworms, but also consumes small fish, tadpoles, and snails.

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Habitat Wetlands, riverbanks, damp meadows, and suburban gardens with permanent ponds or irrigation ditches.

Behavior

The Mediterranean Water Shrew is a high-energy, semi-aquatic mammal that lives life at a frantic pace. Because of its exceptionally high metabolic rate, it must consume nearly its own body weight in food every day, leading to a lifestyle of near-constant foraging. While it is a capable swimmer and diver, it is generally less specialized for water than its close relatives, often spending a significant portion of its time hunting in damp leaf litter or through subterranean tunnels near the water's edge.

Solitary and fiercely territorial, these shrews use scent marking to define their home ranges. They are known for their 'short-circuit' activity cycle, alternating between intense bursts of hunting and short naps every few hours, regardless of whether it is day or night. Although they are small, they are surprisingly bold predators, sometimes tackling prey larger than themselves by using mildly toxic saliva to incapacitate victims like frogs or large insects.

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Camera Tips

Capturing a Mediterranean Water Shrew on a trail camera requires a specialized setup due to their diminutive size and rapid movements. You should place your camera at a 'micro' height, no more than 10–15 centimeters (4-6 inches) off the ground. The best locations are 'funnel points' along water edges, such as gaps between rocks on a stream bank, holes in a retaining wall, or a narrow path through thick bankside sedges. Because they move so quickly, a standard photo trigger often results in a 'ghost' image or a blank frame; always use video mode with the shortest possible trigger interval.

To encourage a shrew to pause in front of the lens, use a scent-based lure. A small amount of fish-based wet cat food or a cotton ball soaked in sardine oil works exceptionally well. Place the bait inside a small, ventilated container or a wire mesh cage to prevent the shrew from dragging it away immediately. Position this bait in a small clearing or against a flat rock to provide a clean background that helps the camera's focus lock onto the subject rather than the surrounding grass.

Lighting is a major challenge for close-up shrew photography. Most trail cameras have infrared flashes that are too powerful for subjects just 30 centimeters away, leading to 'white-out' images. You can remedy this by placing a piece of semi-opaque tape or a small strip of paper over part of the IR LED array to diffuse the light. If your camera settings allow, choose a high frame rate (60fps) to help capture their jerky, fast-paced behavior in smooth detail. Seasonally, late spring and early summer are the best times for sightings, as the shrews are most active and juveniles are beginning to disperse.

Similar Species

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

Eurasian Water Shrew

Larger in size with much more prominent silver hair fringes on the feet and tail, acting as paddles for more frequent swimming.

Common Shrew

Lacks the stark black-and-white bicolored coat; the Common Shrew is typically tricolored (dark brown, light brown, and pale) and is strictly terrestrial.

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Frequently Asked Questions

Mediterranean Water Shrew are active both day and night. They follow a polyphasic activity pattern, which means they alternate between short periods of intense hunting and rest throughout a 24-hour cycle to maintain their high metabolism.

To attract them, maintain a chemical-free garden with a permanent water source like a pond. Provide plenty of 'messy' areas with dense ground cover, log piles, and leaf litter near the water, as these provide the cover and insect prey the shrews need.

Their diet is varied but mostly consists of protein. They eat aquatic insects, larvae, small crustaceans, earthworms, and snails. Occasionally, they will also hunt small vertebrates like tadpoles or tiny fish.

They can be common in suburban areas provided there is suitable habitat. If your garden is near a stream, marsh, or has a well-vegetated pond, these shrews may inhabit the area, though they are rarely seen due to their secretive nature.

The Mediterranean Water Shrew is generally smaller and has much less developed 'fringes' of stiff swimming hairs on its tail and hind feet. If you see a water shrew in a drier habitat further from open water, it is more likely to be the Mediterranean species.

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