Asian House Shrew

Fascinating facts about the Asian House Shrew

• A shrew's heart beats 1,200 times per minute — so fast you'd hear it as a high-pitched hum if you held one in your palm. To fuel that metabolic furnace, the Asian house shrew must eat nearly its entire body weight in insects and earthworms every single day, or it starves within hours. This tiny predator (weighing only 150 grams) burns energy at a rate that would exhaust most animals ten times its size.
• The Asian house shrew produces a pungent musky odour from glands along its flanks — a chemical signature so potent it deters snakes and larger predators, and marks its territory across the kitchen floors and storage rooms it hunts through. This scent is its calling card in the dark, announcing 'this human dwelling is claimed' to every other shrew within the neighbourhood.
• Unlike most shrews, the Asian house shrew has venomous saliva. When it bites prey — or the occasional human finger — it injects mild toxins from glands in its lower jaw that help subdue struggling insects and earthworms. Few people notice the venom; fewer still realise they've been envenomated by an animal smaller than a teaspoon.
• In Southeast Asia's humid tropics, the Asian house shrew became humanity's accidental roommate over centuries, following grain stores and the insects they attract into villages and cities. Today it thrives in urban homes across the region far better than in natural forest — a rodent-sized mammal that chose human settlements as its permanent habitat long before we asked.
• The shrew navigates pitch-black spaces using echolocation — clicking its tongue to map the interior of walls and crevices where it hunts. Its brain, though smaller than a peanut, processes sound reflections fast enough to locate a moving insect in the dark. This biological sonar, rarely mentioned in human culture, is as sophisticated as any bat's, just quieter and overlooked.

At a glance

About the Asian House Shrew

In the warm, humid underbrush of Asian forests, the Asian House Shrew darts with frenetic energy, its tiny paws barely touching the ground as it pursues its relentless quest for insects and seeds. With eyes shining like dark jewels, this diminutive predator navigates the labyrinthine world of leaf litter and ferns, its pointed snout twitching as it detects the faintest whispers of movement. As it forages, the shrew's sleek, grey-brown coat blends seamlessly into the dappled shadows, rendering it all but invisible as it goes about its busy, secret life.

Discover more wildlife