Ornate Shrew (Sorex ornatus) lives in western coastal forests across Western North America. It feeds on insects and worms. Its conservation status is Least Concern.
Fascinating facts about the Ornate Shrew
- From late February through October, ornate shrews breed, producing litters of four to six pups that live about a year. With a gestation that likely mirrors other shrews at roughly 21 days, the young must grow fast; they rely on a diet of at least 24 insects each day to fuel rapid growth and maintain body heat. This short, intense life cycle creates a high turnover.
- Ornate shrews inhabit coastal marshes from roughly 39° N latitude in California down the Baja peninsula, even reaching islands like Santa Catalina. They can survive at elevations up to 2,400 m (7,900 ft) in the San Jacinto Mountains, showing a surprising tolerance for altitude as long as dense, moist vegetation is present. Their dependence on wet, vegetated habitats makes them especially vulnerable to drainage and wetland loss.
- Human impacts have pushed some ornate shrew groups toward the brink: selenium levels in captured individuals were 3 to 25 times higher than in other mammals, a toxic spike. The once-common tule shrew vanished, and the Buena Vista Lake subspecies is endangered. Yet a massive camera-trap effort beginning in 2016 with 200,000 photos and up to 1,500 traps caught the Catalina shrew on film in 2020 after a 15-year gap.
- Weighing just 5.12 g and measuring about 99.4 mm from nose to tail tip, the ornate shrew is a pocket-sized mammal that still packs the highest brain-to-body weight ratio of any vertebrate.
- Genetic work has split the ornate shrew into three main lineages, Southern, Central and Northern. This geographic isolation is recorded in both skull shape and DNA.
Sources
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At a glance
RangeWestern North America
HabitatWestern coastal forests
DietInsects and worms
About the Ornate Shrew
In the dense, shadowy undergrowth of the forest floor, the ornate shrew darts and weaves with reckless abandon, its tiny, pointed snout twitching as it navigates a labyrinthine world of leaf litter and twig. With each fleeting movement, its soft, grey-brown fur blends seamlessly into the surroundings, rendering this diminutive creature all but invisible as it pursues its relentless quest for insect prey. As it scurries through the underbrush, the ornate shrew's very existence is a testament to the boundless energy and tenacity that can be found in even the smallest of creatures.
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