Mammals Active day and night

Pacific Shrew

Sorex pacificus

iNaturalist Wikipedia

The cinnamon-furred ghost of the Oregon undergrowth, the Pacific Shrew is a relentless hunter of the damp forest floor. Found only in a narrow coastal strip of the Pacific Northwest, this tiny dynamo never stops moving in its quest for survival.

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0 Habitats

Quick Identification

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Size

Total length 135–170 mm (5.3–6.7 in); Weight 10–18 g (0.35–0.63 oz)

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Colors

Uniform cinnamon-brown to reddish-brown dorsal fur with a slightly paler, buff-colored underside

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Key Features

Distinctive cinnamon or reddish-tinted velvety fur
Unusually long tail for a shrew, often over 60mm
Highly elongated, flexible snout with sensitive whiskers
Extremely small, bead-like eyes and ears nearly hidden by fur

When You’ll See Them

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Activity pattern Active day and night

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Peak hours Intermittent 24-hour activity; highest frequency at dawn and dusk

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Season Year-round; most visible during wet spring and autumn months

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Diet Voracious insectivore feeding on earthworms, slugs, snails, spiders, and various insect larvae found in moist soil.

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Habitat Damp coniferous and deciduous forests, specifically near creeks, springs, and areas with heavy downed woody debris.

public Geographic range

Where Does the Pacific Shrew Live?

North America is the exclusive home of this species, which maintains a very specific and narrow distribution along the Pacific coast. It is endemic to the western regions of Oregon, stretching from the Siltcoos Lake area south through the Umpqua River basin and into the northernmost coastal forests of California. This shrew is a true specialist of the Pacific Northwest's temperate rainforests, rarely venturing far from the humid, mossy corridors of the coastal mountain ranges.

Basemap © OpenStreetMap contributors

1 Countries

45K km² Range

Least Concern Conservation

US United States

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iNaturalist / Verified observation data

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Behavior

The Pacific Shrew is a high-octane insectivore that lives life in the fast lane. Due to an incredibly high metabolic rate, these tiny mammals are active in short bursts throughout the day and night, rarely sleeping for more than a few minutes at a time. They are solitary and fiercely territorial, patrolling the 'subnivean' zone—the space between the soil and the leaf litter—in a constant search for their next meal.

They are masters of the damp forest floor, utilizing a network of tunnels under fallen logs and thick mats of ferns. Unlike many rodents, they do not hibernate; instead, they remain active year-round, even in the coldest winter months, as long as they have access to their moist refuge. When they aren't hunting, they are meticulous nest-builders, weaving intricate balls of moss, dried grass, and lichen tucked deep into the crevices of rotting stumps or collapsed trees.

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Camera Tips

To successfully capture a Pacific Shrew on camera, you must think small and stay low. These mammals rarely leave the safety of the leaf litter or log edges, so your camera should be mounted no more than 2 to 4 inches off the ground. Aim the lens across a 'natural bridge'—a mossy fallen log or a clear path through dense sword ferns. Because of their tiny stature, a camera with a close-focusing lens or a macro-conversion lens will yield much better results than a standard trail cam.

Metabolism is your best friend when it comes to luring these shrews. While they don't eat seeds like mice, they are highly attracted to strong-smelling protein. A tiny amount of wet cat food, sardine oil, or even mealworms placed inside a protective 'bait station' (like a small PVC pipe segment) will encourage them to linger in front of your lens. This is critical because their natural movement is a series of lightning-fast zig-zags that usually result in blurry photos.

Settings are vital for such a fast-moving subject. Use the fastest trigger speed your camera allows (ideally 0.1 or 0.2 seconds) and set your device to record high-frame-rate video rather than still photos. In the dark, damp forests they inhabit, make sure your infrared flash is set to 'High Speed' or 'Fast Motion' to prevent the white-blur effect of a moving shrew at night. If you're setting up near a creek, ensure your PIR (motion sensor) sensitivity is set to high, as these shrews have very little body mass to trigger the sensor.

Similar Species

Species that look similar or are commonly confused with Pacific Shrew.

Fog Shrew

Very similar in size but has a darker, more grayish-brown coat compared to the cinnamon-red of the Pacific Shrew.

Vagrant Shrew

Significantly smaller with a shorter tail and generally grayer fur; found in a much wider variety of habitats.

Marsh Shrew

Much larger and nearly black in color; possesses specialized stiff hairs on its feet for swimming in water.

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Frequently Asked Questions

Pacific Shrews are active both day and night throughout the entire year. Because their metabolism is so high, they must forage for food every few hours to prevent starvation, resulting in short bursts of intense activity followed by brief periods of rest.

If you live in western Oregon or northern California, you can attract them by maintaining a 'messy' garden. Leave fallen logs, thick layers of leaf mulch, and dense ground cover like ferns. Avoid all pesticides, as these shrews rely on a healthy population of worms and insects to survive.

They are primarily insectivores. Their diet consists of earthworms, slugs, snails, spiders, and various insect larvae. They are known to be voracious eaters, often consuming their own body weight in prey within a single 24-hour period.

They are less common in manicured suburban lawns but can be found in backyards that border natural woodlands, ravines, or creeks. They require high humidity and significant ground cover, so they are rarely found in dry or open urban environments.

The best way to identify the Pacific Shrew is by its size and color; it is larger than the common Vagrant Shrew and possesses a distinct cinnamon-red or brownish-red tint to its fur, whereas many other local species are more grayish or dark brown.

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