Mammals Active day and night

Smoky Shrew

Sorex fumeus

iNaturalist Wikipedia

A tiny dynamo of the forest floor, the smoky shrew is a lead-colored hunter that never stops moving. This elusive North American mammal thrives in the damp shadows, playing a vital role in controlling insect populations.

0 Sightings

0 Habitats

Quick Identification

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Size

11–13 cm (4.3–5.1 in) in length; weight 6–11 g (0.2–0.4 oz)

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Colors

Uniformly dull smoky-gray or brownish-gray; slightly lighter underparts; bicolor tail (darker above, lighter below)

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Key Features

Dull smoky gray coat with no sharp color lines
Long tail roughly 40% of its total body length
Small eyes and prominent, sensitive whiskers
Pale yellowish-pink feet

When You’ll See Them

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Activity pattern Active day and night

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Peak hours 9 PM - 4 AM

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Season Year-round

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Diet Primarily insectivorous; hunts for earthworms, beetles, spiders, centipedes, and snails. They also consume some fungi and vegetable matter.

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Habitat Damp, shaded deciduous or coniferous forests with thick leaf litter, mossy rocks, and decaying logs.

public Geographic range

Where Does the Smoky Shrew Live?

The smoky shrew is native to the cool, moist temperate regions of North America. Its core range extends from southeastern Canada, through the New England states, and down the Appalachian Mountains into northern Georgia and South Carolina. They are most commonly found in high-elevation forests in the southern parts of their range, while they inhabit a broader variety of lowland wooded areas in the north.

Basemap © OpenStreetMap contributors

2 Countries

1.2M km² Range

Least Concern Conservation

US United States CA Canada

Elevation range

0 m1,000 m2,000 m4,000 m

Sea level – 2,000 m

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iNaturalist / Verified observation data

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Behavior

The smoky shrew is a high-velocity insectivore that lives life at a frantic pace. Driven by an incredibly high metabolic rate, it must consume nearly its own body weight in food every day to survive. These shrews are active year-round, day and night, never hibernating and instead spending the winter months tunneling through the subnivean zone beneath the snow or within the deep leaf litter of the forest floor.

Solitary and territorial, the smoky shrew is known for its high-pitched vocalizations, which it uses to communicate or warn off intruders. While they are capable of digging their own burrows, they are opportunistic and frequently utilize the abandoned tunnels of moles, voles, or larger shrew species. They are almost constantly on the move, using their sensitive snout and whiskers to navigate the dark crevices of their damp, forest-floor habitat.

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Camera Tips

Capturing a smoky shrew on a backyard camera requires a strategy tailored to their tiny size and extreme speed. Because they are too small to trigger many standard PIR (Passive Infrared) sensors from a distance, you must position your camera very close to the ground. Aim for a height of only 2 to 5 inches, and if your camera has a focal adjustment or macro setting, use it, as the shrew will likely be passing just a foot or two from the lens.

Location is everything for these forest-floor dwellers. Look for 'micro-corridors' such as the edge of a mossy log, a natural gap between rocks, or a clear path through damp leaf litter near a water source. These are the highways shrews use to stay under cover while hunting. Since they are scent-motivated, you can encourage them to pause in front of your camera by using a small amount of lure, such as a cotton ball soaked in sardine oil or a tiny smear of fish-based cat food tucked into a crevice.

To ensure you don't just get a blurry tail in your shot, set your camera to its fastest trigger speed and use the 'burst mode' to take 3-5 photos per trigger. Video mode is also highly effective, as it captures their unique, twitchy movement patterns. If you are monitoring them in winter, place your camera near woodpiles or foundation stones where the ground stays slightly warmer, as these are prime hunting grounds for shrews during the coldest months.

Similar Species

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

Masked Shrew

Smaller with a shorter tail and a more distinct brown-over-gray color pattern.

Northern Short-tailed Shrew

Much larger and heavier with a very short tail and a more robust, velvety body.

Long-tailed Shrew

Nearly identical but has an even longer tail and typically prefers higher, rockier elevations.

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Frequently Asked Questions

Smoky shrews are active day and night throughout the year, but they tend to show increased activity during the night, particularly in the hours between dusk and dawn when humidity levels are higher.

To attract smoky shrews, maintain a 'wild' corner in your yard with thick leaf litter, decaying logs, and rock piles. Avoiding pesticides is crucial, as they need a healthy population of soil invertebrates like earthworms and beetles to eat.

They are voracious predators of invertebrates, eating earthworms, snails, spiders, and various insect larvae. They must eat nearly their own body weight daily to sustain their metabolism.

They are less common in manicured suburban lawns than other species like the Northern Short-tailed Shrew. They prefer established woodlands with plenty of moisture and ground cover, so they are mostly found in backyards that border forests or streams.

The smoky shrew is distinguished by its uniform dull gray color, lacking the sharp contrast between back and belly seen in many other species. It also has a noticeably longer tail than the Cinereous (Masked) Shrew.

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