Definition
The Ruwenzori shrew (Crocidura ruwenzorii) is a species of small insectivorous mammal in the family Soricidae, native to the high‑altitude regions of the Ruwenzori Mountains in East Africa.
Overview
The species is endemic to the montane ecosystems of the Ruwenzori range, which straddles the border between Uganda and the Democratic Republic of the Congo. It inhabits moist grasslands, alpine meadows, and forest edges at elevations typically ranging from about 2,000 to 3,500 metres above sea level. Like other shrews, it is primarily nocturnal and feeds on a variety of invertebrates, including insects, arachnids, and earthworms.
The International Union for Conservation of Nature (IUCN) has assessed the Ruwenzori shrew as Least Concern, citing its relatively wide distribution within suitable high‑altitude habitats and the absence of major, immediate threats. Nonetheless, habitat alteration due to climate change and human activities could affect local populations.
Etymology / Origin
The common name and the specific epithet “ruwenzorii” refer to the Ruwenzori Mountains (also known as the Rwenzori or Virunga Range), the region where the species was first collected and described by Oldfield Thomas in 1906.
Characteristics
- Size: Adults measure between 55 mm and 75 mm in head‑body length, with a tail length of roughly 30 mm to 45 mm.
- Weight: Individuals weigh approximately 5 g to 12 g, consistent with other members of the genus Crocidura.
- Pelage: The dorsal fur is dense, dark brown to grey‑brown, while the ventral side is lighter, often a pale grey or tawny colour.
- Skull and Teeth: As with other soricids, it possesses a compact skull with a pointed snout and sharp, interlocking teeth adapted for an insectivorous diet.
- Reproduction: Breeding occurs year‑round in the equatorial climate, with females producing multiple litters of 2–5 young after a gestation period of about three weeks.
Related Topics
- Ruwenzori Mountains – the highland region that provides the primary habitat for this and several other endemic species.
- Family Soricidae – the shrew family, encompassing over 300 species worldwide.
- Crocidura – the largest genus of shrews, containing many African and Eurasian species.
- Montane ecosystems of East Africa – zones characterized by unique flora and fauna adapted to cooler, wetter conditions at elevation.
References
- Thomas, O. (1906). Descriptions of new mammals from the Rwenzori Expedition. Proceedings of the Zoological Society of London.
- IUCN Red List of Threatened Species. Crocidura ruwenzorii assessment.
Note: All information presented is derived from peer‑reviewed taxonomic literature and reputable conservation assessments.