Common shrew

The common shrew (Sorex araneus) is a small mammal belonging to the order Eulipotyphla and the family Soricidae. It is often confused with mice but differs significantly in its biological characteristics.

It is characterized by a long, pointed snout (proboscis), tiny eyes, and velvety fur that is usually dark brown on the back and lighter on the belly.

Because of their extremely high metabolism, shrews must eat almost constantly throughout the day and night to survive.

Their dental structure is specialized for an insectivorous diet, featuring sharp, pigmented teeth that are distinct from the gnawing incisors of true rodents.

Shrews are solitary and territorial animals, and they play a vital role in natural ecosystems by controlling populations of invertebrates.

Shrews are beneficial predators in the garden, consuming large quantities of slugs, beetles, larvae, and other pests that would otherwise damage crops.

They do not consume plant material, as they are strict carnivores. Therefore, they do not nibble on roots, tubers, bulbs, or seedlings.

Damage caused by shrews is purely mechanical; their tunnel-making activities can disturb the roots of young plants in loose or freshly tilled soil.

If a plant is damaged by a shrew, it is usually incidental—the shrew was likely chasing a worm or larva near the roots rather than targeting the plant itself.

In most professional agricultural settings, the damage caused by these tunnels is considered negligible compared to the benefits of their pest-control services.

Common shrews remain active throughout the entire year. They do not hibernate, which is a necessity given their high energy requirements.

In the spring, as soil temperatures rise, shrews become highly active in the upper layers of the ground searching for emerging insects.

During the summer months, they are often found in thick vegetation, hedge bottoms, and mulch, where they can find an abundance of prey.

In autumn and winter, they may move deeper into the soil or underneath insulating plant debris or logs to maintain their body temperature.

Their reproductive activity usually occurs between spring and late summer, which creates a peak in shrew population density during these months.

The primary sign of a shrew's presence is the appearance of narrow, surface-level tunnels or runways, often hidden by leaves or grass.

These tunnels are quite thin, usually about 2 to 3 centimeters in diameter, which distinguishes them from the larger burrows created by moles or rodents.

Plants might show signs of wilting if a tunnel runs directly beneath the root system, causing the soil to shift and dry out around the roots.

The absence of chewed seeds, gnawed bark, or destroyed fruit is a reliable indicator that the animal causing soil disturbance is a shrew.

You may also find small, cylindrical droppings left near the entrance of their tunnels or in shaded areas of the garden.

Control measures for common shrews are rarely recommended, as they are highly beneficial animals that reduce the need for chemical insecticides.

To prevent plant damage, gardeners should focus on firming the soil around newly planted seedlings to eliminate air pockets created by tunnels.

If physical exclusion is necessary, buried wire mesh or root barriers can be installed around the perimeter of specific high-value flower beds.

Managing the mulch layer and reducing the amount of surface debris can discourage insects, which in turn makes the area less attractive to hunting shrews.

Using ultrasonic repellents can encourage the animals to relocate if their tunnel-digging becomes too disruptive to a specific landscaped area.