AT A GLANCE
- Common Name: Dobson’s Shrew Tenrec
- Scientific Name: Microgale dobsoni
- Category: Mammals
- Subcategory: Tenrecs
- Range: Endemic to the island of Madagascar, distributed across the eastern montane rainforest belt and central high plateau, from the Tsaratanana Massif south to Andohahela
- Habitat Type: Pristine montane rainforests, high-altitude cloud forests, mossy dwarf forests, and humid forest edge mosaics at elevations between 800 and 2,500 meters
- IUCN Red List Status: Least Concern
- Lifespan: 2 to 4 years
- Diet: Insectivorous (probing damp moss and leaf litter for earthworms, terrestrial amphipods, beetle larvae, crickets, spiders, and centipedes)
- Average Size/Weight: Head-and-body length 9 to 11 cm; tail length 11 to 14 cm; weight 25 to 45 g (tail can add an additional 15 g when fat-loaded)
- Key Defining Feature: Slender, long-tailed shrew tenrec with soft greyish-fawn fur, sharp conical teeth, and an extraordinarily thick, carrot-like incrassated tail used to store vital lipid reserves
Overview
Dobson’s Shrew Tenrec (Microgale dobsoni), named in honor of Irish zoologist George Edward Dobson, is a delicate, fascinating afrotherian mammal endemic to the ancient, mist-drenched cloud forests of eastern Madagascar. Belonging to the diverse tenrec family Tenrecidae, this secretive forest forager superficially resembles an ordinary European or American shrew. However, it belongs to the ancient superorder Afrotheria and possesses a remarkable physiological adaptation: an elongated, muscular tail that transforms into a plump, fat-storing biological battery to survive cold mountain winters.
Biology and Physical Characteristics
Microgale dobsoni has a slender, flexible body clothed in short, exceptionally soft and dense velvet-like fur, colored warm brownish-grey to fawn on the back, blending to silvery grey on the belly. Its head is elongated and tapered, ending in a flexible, pink, whisker-covered snout and tiny, glistening black eyes. Its most distinctive characteristic is its long, semi-prehensile tail, which is longer than its head-and-body length. During warm, insect-rich summer months, specialized adipose tissues within the subcutaneous sheath of the tail absorb enormous lipid reserves, swelling the tail into a heavy, swollen, carrot-shaped reservoir that provides metabolic fuel during cold, food-depleted winter droughts.
Behavior and Ecology
Primarily nocturnal and terrestrial, Dobson’s Shrew Tenrec scampers through the dense moss carpets, rotting tree logs, and leaf litter of the high montane forest floor. It is an energetic, restless predator, using its sensitive tactile snout and keen hearing to detect the faint rustling of earthworms and beetle larvae hidden beneath decaying organic mulch. When mountain temperatures plunge during winter, it enters multi-day bouts of torpor inside snug subterranean nests lined with shredded moss and tree-fern scales, slowly metabolizing the rich fat reserves stored within its swollen tail.
Conservation and Human Impact
Dobson’s Shrew Tenrec is classified as Least Concern on the IUCN Red List due to its relatively wide distribution across the eastern rainforest spine of Madagascar. While secure within major protected areas like Ranomafana and Andasibe-Mantadia National Parks, localized populations are threatened by habitat degradation driven by slash-and-burn agriculture (tavy), illicit charcoal burning, and livestock grazing.
Interesting Factoid
During the warm summer in Madagascar, Dobson’s Shrew Tenrec eats so many forest bugs that its tail swells up like a plump sausage, storing nearly half of the animal’s total body weight in pure fat for the cold winter.