Sorex trowbridgii
Silhouette: Becky Barnes · PhyloPic
In 3 days ~10% in a week ~20%
Trowbridge's shrew (Sorex trowbridgii) is a species of mammal in the family Soricidae. It is found in southern British Columbia in Canada and in Washington, Oregon, and California in the United States. Trowbridge's shrew was first described in the scientific literature in 1857 by Spencer Fullerton Baird, in a report of surveys and explorations conducted to find a suitable route for a railroad from the Mississippi to the Pacific Ocean. The scientific name given was Sorex trowbridgii. The generic name Sorex is Latin, meaning "shrew-mouse." The species name "trowbridgii" is a patronym to honor William Petit Trowbridge. The type locality for the species is Astoria, Oregon. Baird's initial record describes four specimens made available to him. The first two were provided by Trowbridge. They were skins that had been collected by "Jas. Wayne" in June 1855. The other two specimens were collected by George Suckley at Fort Steilacoom in 1856. Those two specimens were preserved in alcohol prior to submission to Baird.
Trowbridge's shrew is a medium-sized shrew with a long tail. Non-breeding shrews weigh around 3.8 g (0.13 oz) while breeding shrews average... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Redwood National Park | 🇺🇸 United States |
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Portland | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report a Trowbridge's Shrew sighting in Portland on a given day, based on 9 verified sightings from GBIF citizen-science data. It is the 23rd most-seen of the 27 mammals we can rate there. Over three days the chance rises to about 10%, and over a week to about 20%, if each day is a fresh chance.
June and July
In those months about 10% of wildlife watchers report a Trowbridge's Shrew in Portland on a given day, against under 5% in August to May, the lowest months. Those are among Portland's driest months, with about 35 mm of rain a month against 250 mm in December.
Between 9 am and noon
Across all the parks we cover, that three-hour window holds the most Trowbridge's Shrew sightings with a recorded time, and about 8 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Only Portland, in our data
Portland is the only city on Wallace's Line with enough records to rate Trowbridge's Shrew sightings: under 5% of wildlife watchers there report one on a given day.
GBIF citizen-science records
It is estimated from how often the Trowbridge's Shrew is recorded against all the mammals logged in Portland (9 verified sightings), calibrated against known sighting rates. Figures are rounded to the nearest 10% because citizen-science data supports honest approximations, not decimals, and months with records from fewer than five people show "—". How it works.
