Species: Sorex trowbridgii
Trowbridge's Shrew
Species
Show on Lists
Encyclopedia of Puget Sound
Classification
Kingdom
Animalia
Phylum
Craniata
Class
Mammalia
Order
Soricomorpha
Family
Soricidae
Genus
Sorex
NatureServe
Classification
Other Global Common Names
musaraigne de Trowbridge
Informal Taxonomy
Animals, Vertebrates - Mammals - Other Mammals
Formal Taxonomy
Animalia - Craniata - Mammalia - Soricomorpha - Soricidae - Sorex - See George (1988) for electrophoretic study of systematic relationships among SOREX species.
Ecology and Life History
Migration
true - false - false
Non-migrant
true
Locally Migrant
false
Food Comments
Primarily insectivorous, also feeds on spiders, worms, and centipedes. Feeds on more vegetable matter than other shrews in this genus (Banfield 1974). Known to feed on seeds of Douglas-fir, pine, and other plants, especially in winter.
Reproduction Comments
Pregnant females recorded March-May in Washington; 3-4 embryos. Breeds February-early June in Sierra Nevada; average of 5 embryos; post-partum pregnancy probably common. Average of 3.9 embryos in Oregon. Age of sexual maturity less in areas with warmer climate.
Ecology Comments
Maximum life-span estimated at about 18 months. Populations decline after forest wildfires. Fall population tends to be about double spring population (George 1989).
Length
13
Weight
9
Conservation Status
NatureServe Global Status Rank
G5
Global Status Last Reviewed
1996-11-01
Global Status Last Changed
1996-11-01
Other Status
LC - Least concern
Distribution
Conservation Status Map
<img src="http://www.natureserve.org/explorer/servlet/GetMapGif?CA.BC=S3&US.CA=SNR&US.NV=S2&US.OR=S4&US.WA=S5" alt="Conservation Status Map" style="width: 475px; height: auto;" />
Global Range
FG - 20,000-2,500,000 square km (about 8000-1,000,000 square miles) - FG - Coastal southwestern British Columbia south of Burrard Inlet south through western Washington and Oregon to northwestern California, south through coast ranges to Santa Barbara County, east to Warner Mountains (northeastern California), south through Sierra Nevada to Kern County, California (George 1989). Sea level to 1820 m.
Global Range Code
FG
Global Range Description
20,000-2,500,000 square km (about 8000-1,000,000 square miles)