Taxonomy
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Mammal
- Order
- Eulipotyphla
- Family
- Soricidae
- Genus
- Cryptotis
Habitat
This species primarily inhabits moist environments such as streams, rivers, and forested areas with dense vegetation in Japan, particularly in Honshu and Kyushu islands. It prefers areas with access to water for foraging and shelter, often in lowland and mountainous regions up to 1,500 meters.
Diet
The Japanese water shrew feeds mainly on aquatic insects, small crustaceans, earthworms, and occasionally small fish or amphibians. It hunts actively in water and on land, using its sensitive snout to detect prey, and is most active during dawn and dusk. Feeding behavior involves quick, darting movements to capture food.
Behavior
Japanese water shrews are solitary and territorial, marking their areas with scent and avoiding direct contact with others except during mating. They are primarily nocturnal, spending their active time foraging in water or along stream banks, and they exhibit quick, agile movements to evade threats. These shrews are known for their high metabolic rate, requiring constant feeding, and they often create shallow burrows near water for shelter.
Conservation Status
The IUCN status of the Japanese water shrew is Data Deficient due to limited data, but it is not currently considered threatened with a stable population trend. Major threats include habitat loss from urbanization and pollution in Japanese waterways.