Long-footed Shrew

The Long-footed Shrew is a small insectivorous mammal native to the montane and lowland forests of Sumatra and Java. It belongs to the diverse white-toothed shrew genus Crocidura, characterized by its relatively elongated hindfeet, an adaptation that distinguishes it from many congeners. Little is known about its precise ecology due to its secretive, nocturnal habits and the difficulty of distinguishing it morphologically from similar sympatric shrew species.

Sumatra and Java, Indonesia, with some records from the Malay Peninsula

Endemic to the Sundaland region of Southeast Asia, with confirmed populations on the islands of Sumatra and Java, Indonesia. Some taxonomic uncertainty exists regarding its presence on the Malay Peninsula.

Altitude and depth

0-2000 meters above sea level, with most records from mid-elevation forest zones between 500-1500m

Primarily found in tropical and subtropical moist lowland and montane forests, often near streams and in leaf litter-rich understory. It also occupies degraded secondary forest and forest edges bordering agricultural land.

Adaptations to its environment

Its elongated hindfeet may aid in traversing damp, uneven forest floor terrain and leaf litter more efficiently. Like other shrews, it possesses a high metabolic rate requiring near-constant foraging, and a keen sense of smell and touch compensates for poor eyesight in the dim forest understory.

Listed as Least Concern by the IUCN due to its relatively wide distribution across Sumatra and Java and presumed tolerance of some habitat disturbance, though population trends are not well documented.

Estimated population

No precise population estimates exist; the species is presumed to have a stable but undocumented population trend given its LC status

Deforestation and habitat conversion for palm oil plantations and agriculture across Sumatra and Java pose the primary long-term threat. Forest fragmentation may also isolate populations and reduce genetic connectivity.

Diseases and parasites

Specific data unavailable, though like most shrews it likely hosts various ectoparasites such as mites and fleas, and endoparasites including nematodes.

No species-specific conservation programs exist; the shrew benefits indirectly from protected forest areas and national parks within its range, such as those in Sumatra's remaining rainforest blocks.

Recommended actions

Increased survey effort to clarify distribution and population status, continued protection of remaining lowland and montane forest habitat, and taxonomic studies to resolve species boundaries with related Crocidura taxa.

Dense, soft fur that is typically dark grayish-brown to sooty gray on the dorsal surface, lightening slightly on the underparts. It has a pointed snout, small eyes, and the namesake elongated hindfeet relative to body size.

Size

Head-body length approximately 65-85 mm, with a tail of roughly 40-60 mm

Weight

Estimated 5-10 grams, typical for small Crocidura shrews

Distinctive features

Distinguished from closely related Crocidura species primarily by its notably long hindfeet and subtle cranial and dental characteristics visible under close examination.

Solitary and territorial, as is typical for most Crocidura shrew species, with individuals generally avoiding one another outside of breeding encounters.

When it is active

Primarily nocturnal and crepuscular, foraging actively at night and during twilight hours in leaf litter and low vegetation.

Diet

Insectivorous, feeding on a variety of small invertebrates including insects, earthworms, spiders, and other soil-dwelling arthropods found in leaf litter.

How it feeds and hunts

Forages by actively probing leaf litter and soil with its sensitive snout and whiskers, relying on touch and smell rather than sight to locate prey.

Communication

Likely communicates through high-frequency vocalizations, scent marking via specialized flank glands, and tactile cues, consistent with other shrew species.

Interactions with other species

Preyed upon by small forest carnivores, owls, and snakes; competes with other small insectivorous mammals for leaf-litter invertebrate prey within its forest habitat.

Role in its ecosystem

Plays a role as a mesopredator of invertebrates within the forest leaf-litter ecosystem, helping regulate insect and arthropod populations.

Breeding biology is poorly documented but likely follows the general Crocidura pattern of short gestation (around 25-30 days) and multiple litters per year in favorable conditions.

Raising the young

Presumed maternal care only, as is typical of shrews, with the female raising altricial young alone in a nest until weaning at a few weeks of age.

Maturity and lifespan

Sexual maturity likely reached within a few months, as in related shrews; lifespan in the wild is probably short, around 1-2 years, typical for small-bodied Soricidae.

Classification

Mammalia > Eulipotyphla > Soricidae > Crocidura > Crocidura crenata

Scientific synonyms

Crocidura fuliginosa crenata (formerly considered a subspecies of the Southeast Asian gray shrew before being elevated to full species status)

Recent studies

Recent taxonomic revisions of Sundaland Crocidura species using molecular and morphological data have helped clarify the distinct status of C. crenata from closely related forms, though further genetic studies are needed.

Compared with similar species

Similar in size and habits to other Sundaland shrews such as Crocidura fuliginosa, from which it was historically considered a subspecies, but distinguished by proportionally longer hindfeet and subtle skull differences.

Despite its common name highlighting its feet, the Long-footed Shrew was only recognized as a distinct species relatively recently after being reclassified from a subspecies. Like all shrews, it must eat almost constantly due to an extremely fast metabolism, consuming amounts of food close to its own body weight daily.

Where and how to see it

Best observed by researchers using live-trapping methods in undisturbed lowland to mid-elevation rainforest of Sumatra or Java at night, as the species is rarely seen due to its secretive, nocturnal, leaf-litter-dwelling habits.

Risks to humans

No notable risk