Glass's Shrew

Glass's Shrew is a small, poorly studied insectivorous mammal endemic to the Ethiopian highlands. It belongs to the diverse white-toothed shrew genus Crocidura, which includes hundreds of species across Africa and Eurasia. The species is notable for its restricted range and adaptation to high-altitude Afroalpine and montane habitats. Very little is known about its biology due to the difficulty of studying small, cryptic shrews in remote highland areas.

Endemic to Ethiopia, primarily known from the Bale Mountains region and surrounding highlands

Restricted to Ethiopia, with records concentrated in the Bale Mountains and potentially other highland areas of the Ethiopian Plateau. This is a narrow-range endemic species with a very limited known distribution.

Altitude and depth

Approximately 2500-4000 meters above sea level, typical of Ethiopian highland and Afroalpine zones

Found in Afromontane forest, high-altitude grassland, and Afroalpine moorland habitats, typically in areas with dense vegetation cover and leaf litter that support invertebrate prey.

Adaptations to its environment

As with other high-altitude shrews, likely possesses a high metabolic rate and dense fur for thermoregulation in cool montane climates. Small body size allows exploitation of microhabitats within leaf litter and soil for insect foraging.

Near Threatened (NT) according to IUCN, due to its restricted range and potential habitat degradation in the Ethiopian highlands, though data remain limited.

Estimated population

No reliable population estimate exists; the species is considered rare or uncommon based on limited trapping records, with an unknown but likely declining trend due to habitat pressures.

Habitat loss from agricultural expansion, livestock grazing, and human settlement encroachment into highland forests and grasslands within its limited range.

Some protection may be afforded by the Bale Mountains National Park, which covers part of its known range, though no species-specific conservation programs are documented.

Recommended actions

Increased survey effort to determine distribution and population status, habitat protection within and around Bale Mountains National Park, and taxonomic/ecological research to better understand the species.

Small shrew with dense, soft fur typically grayish-brown to dark brown dorsally, lighter grayish underparts, a pointed snout, small eyes, and a moderately long tail covered with fine hairs.

Size

Body length approximately 55-75 mm, with a tail length of roughly 35-50 mm, typical for small Crocidura shrews

Weight

Estimated 3-8 grams, consistent with other small Ethiopian highland shrews

Distinctive features

Distinguished from other Ethiopian Crocidura species by subtle differences in skull morphology, tooth structure, and pelage coloration, though field identification is challenging without genetic or cranial analysis.

Presumed solitary, as is typical for most Crocidura shrews, with individuals maintaining separate foraging territories except during breeding.

When it is active

Likely predominantly nocturnal to crepuscular, though shrews often show bursts of activity throughout day and night due to high metabolic demands.

Diet

Insectivorous, feeding primarily on invertebrates such as insects, larvae, worms, and other small arthropods found in leaf litter and soil.

How it feeds and hunts

Uses acute sense of smell and touch (whiskers) to locate prey in leaf litter and soil, actively foraging and consuming prey items opportunistically.

Communication

Likely uses high-frequency vocalizations, echolocation-like clicks for orientation, and scent marking via specialized flank glands, as observed in related Crocidura species.

Interactions with other species

Likely preyed upon by owls, snakes, and small carnivorous mammals; may compete with other small insectivores and rodents for invertebrate food resources in its habitat.

Role in its ecosystem

Plays a role in controlling invertebrate populations and serves as a prey item within the highland ecosystem food web, contributing to nutrient cycling through insect predation.

Details specific to this species are unknown, but likely similar to related Crocidura species with short gestation periods (around 3-4 weeks) and litters of 2-6 young.

Raising the young

Presumed maternal care only, with females nursing and protecting young in a nest until weaning, typical of shrew reproductive biology.

Maturity and lifespan

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

Classification

Class Mammalia > Order Eulipotyphla > Family Soricidae > Genus Crocidura > Species Crocidura glassi

Recent studies

Limited recent taxonomic and molecular studies on Ethiopian Crocidura species have helped clarify species boundaries, though C. glassi remains understudied compared to more common shrews.

Compared with similar species

Similar in general appearance to other Ethiopian highland shrews such as Crocidura fumosa and Crocidura lucina, but distinguished by specific cranial and dental characteristics requiring expert identification.

Glass's Shrew is one of many poorly known small mammals endemic to Ethiopia's biodiverse highlands, a global hotspot for endemic species. Despite its tiny size, it likely consumes more than its body weight in insects daily due to an extremely high metabolism typical of shrews.

Where and how to see it

Best chance of observation would require live-trapping surveys in Bale Mountains National Park's forest and grassland habitats, though the species is rarely seen due to its secretive, small, and nocturnal nature.

Risks to humans

No notable risk to humans.