Taxonomy
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Mammal
- Order
- Eulipotyphla
- Family
- Soricidae
- Genus
- Sorex
Habitat
Marsh shrews primarily inhabit wet environments such as marshes, swamps, and stream banks in the Pacific Northwest of North America, from Alaska to northern California. They prefer areas with dense vegetation and moist soil for burrowing and cover. These habitats provide ample prey and protection from predators.
Diet
Marsh shrews feed mainly on insects like beetles and ants, earthworms, snails, and other small invertebrates. They are voracious hunters, consuming up to their body weight in food daily, and are primarily nocturnal, probing soil and leaf litter with their sensitive snouts to locate prey.
Behavior
Marsh shrews are solitary and territorial animals, marking their home ranges with scent and aggressively defending them from intruders. They are primarily nocturnal, spending the day in burrows and emerging at night to forage rapidly. Their high metabolism drives constant activity, including vocalizations like high-pitched squeaks for communication.
Conservation Status
The marsh shrew is classified as Least Concern by the IUCN, with a stable population trend. Major threats include habitat loss from wetland drainage and pollution.