Reithrodontomys raviventris
In 3 days ~10%
The salt-marsh harvest mouse (Reithrodontomys raviventris), also known as the red-bellied harvest mouse, is an endangered rodent endemic to the San Francisco Bay Area salt marshes in California. The two distinct subspecies are both endangered and listed together on federal and state endangered-species lists. They are both quite similar in appearance to their congener species, the western harvest mouse (R. megalotis), to which they are not closely related. Genetic studies of the northern subspecies have revealed that the salt-marsh harvest mouse is most closely related to the plains harvest mouse (R. montanus), which occurs in the Midwest. The endangered designation of the salt-marsh harvest mouse is due to its limited range, historic decline in population and continuing threat of habitat loss due to development encroachment on the perimeter of the San Francisco Bay.
The southern population of the salt-marsh harvest mouse tends to have dark brown fur above... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | San Francisco | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report a Salt Marsh Harvest Mouse sighting in San Francisco on a given day, based on 5 verified sightings from GBIF citizen-science data. It is the 37th most-seen of the 38 mammals we can rate there. Over three days the chance rises to about 10%, if each day is a fresh chance.
Any time of year
In every month with enough records, under 5% of wildlife watchers report a Salt Marsh Harvest Mouse in San Francisco on a given day, so our monthly data shows no clear season.
Between 6 and 9 am
Across all the parks we cover, that three-hour window holds the most Salt Marsh Harvest Mouse sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Only San Francisco, in our data
San Francisco is the only city on Wallace's Line with enough records to rate Salt Marsh Harvest Mouse sightings: under 5% of wildlife watchers there report one on a given day.
GBIF citizen-science records
It is estimated from how often the Salt Marsh Harvest Mouse is recorded against all the mammals logged in San Francisco (5 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.
