Moon Shrew

Crocidura selina, the Moon Shrew, is a small insectivorous shrew known from only a handful of specimens collected in the Rwenzori Mountains of Uganda, from which its common name derives (the range's historic epithet 'Mountains of the Moon'). It is a poorly studied member of the diverse African white-toothed shrew genus Crocidura. Its rarity in collections and lack of ecological data have led to its classification as Data Deficient by the IUCN. It likely occupies high-altitude montane forest habitats typical of many Rwenzori endemics.

Known only from the Rwenzori Mountains region (the historical 'Mountains of the Moon') on the Uganda–Democratic Republic of the Congo border, East-Central Africa.

Restricted to the Rwenzori Mountains straddling the border of Uganda and the Democratic Republic of the Congo; may have a very narrow endemic range within this massif.

Altitude and depth

Estimated to occur at moderate to high montane elevations, roughly 1,500–3,000 meters, consistent with other Rwenzori endemic small mammals.

Presumed to inhabit montane and Afro-alpine forest habitats, including leaf litter and dense understory vegetation typical of high-elevation Rwenzori ecosystems; specific habitat preferences remain poorly documented.

Adaptations to its environment

Like other Crocidura shrews, it likely possesses a high metabolic rate, dense fur for thermoregulation in cool montane conditions, and a keen sense of smell and touch (via vibrissae) to locate invertebrate prey in leaf litter with poor visibility.

Listed as Data Deficient (DD) by the IUCN because there is insufficient information on its population size, distribution, ecology, and threats to assess its conservation status accurately.

Estimated population

No population estimate exists; the species is known from very few museum specimens and its current population trend is unknown.

Potential threats include habitat loss from deforestation, agricultural encroachment, and climate change affecting montane ecosystems in the Rwenzori region, though direct evidence linking these threats to this species is lacking.

No species-specific conservation programs exist, but it may benefit incidentally from the protection of the Rwenzori Mountains National Park, a UNESCO World Heritage Site.

Recommended actions

Priority actions include targeted field surveys to determine distribution and abundance, habitat assessments within the Rwenzori range, and genetic studies to clarify taxonomic status and relationships with other Crocidura species.

Presumed to have the typical Crocidura body plan: a pointed snout, small eyes, short dense fur ranging from grayish-brown to dark brown dorsally with paler underparts, and a long tail relative to body size.

Size

Estimated head-body length of approximately 60–80 mm, typical for small Crocidura shrews, though exact measurements from limited specimens may vary.

Weight

Likely weighs between 4–8 grams, consistent with similarly sized African shrews, though precise data are unavailable.

Distinctive features

Distinguished from related Crocidura species primarily through subtle cranial and dental morphological differences identified in the original species description, rather than obvious external features.

Presumed solitary, as is typical for most Crocidura shrews, with limited social interaction outside of mating encounters.

When it is active

Likely nocturnal to crepuscular, foraging actively during low-light hours in leaf litter, consistent with the general behavior of the genus Crocidura.

Diet

Presumed insectivorous, feeding on small invertebrates such as insects, spiders, and worms found in forest leaf litter, similar to other members of the genus.

How it feeds and hunts

Likely relies on scent and tactile cues from vibrissae to locate hidden invertebrate prey in leaf litter and soil, a common foraging strategy among shrews.

Communication

Likely uses ultrasonic vocalizations, scent marking via specialized glands, and tactile cues, consistent with communication methods documented in other Crocidura shrews.

Interactions with other species

Likely predated upon by small carnivores, raptors, and snakes; may compete with other small mammal species for invertebrate prey within its montane habitat.

Role in its ecosystem

As an insectivore, it likely plays a role in regulating invertebrate populations within its montane forest ecosystem and may serve as prey for various predators.

Reproductive biology is unknown, but likely resembles other Crocidura species with short gestation periods (around 3–4 weeks) and multiple small litters per year.

Raising the young

No specific data exists; presumably the female provides sole parental care, nursing and protecting altricial young in a nest until weaning, as in related shrew species.

Maturity and lifespan

Unknown specifically, but likely reaches sexual maturity within a few months and has a short lifespan of 1–2 years, typical for small shrews.

Classification

Mammalia > Eulipotyphla > Soricidae > Crocidura > Crocidura selina

Recent studies

Very few recent studies have focused on this species specifically; most knowledge is derived from limited taxonomic revisions of Crocidura within the Rwenzori and broader East African region.

Compared with similar species

Similar in general appearance to other East African montane Crocidura species, such as Crocidura tarella and Crocidura elgonius, but distinguished by subtle skull and dental characteristics noted in taxonomic descriptions.

Its common name references the 'Mountains of the Moon' (Rwenzori), an evocative name derived from ancient Greek and Ptolemaic geography. It remains one of the least-known mammals in Africa, known from just a few specimens collected decades ago.

Where and how to see it

Due to its rarity and elusive nocturnal habits, observation in the wild is extremely difficult; any sightings would likely occur during dedicated small-mammal trapping surveys in the Rwenzori Mountains at night.

Risks to humans

No notable risk to humans.