Reithrodontomys megalotis
Silhouette: T. Michael Keesey · PhyloPic
In 3 days ~10%
The western harvest mouse (Reithrodontomys megalotis) is a small neotomine mouse native to most of the western United States. Many authorities consider the endangered salt marsh harvest mouse to be a subspecies, but the two are now usually treated separately.
Its range extends from southwest British Columbia and southeast Alberta continuously to west Texas, northeast Arkansas, northwest Indiana, southwest Wisconsin, and the interior of Mexico to Oaxaca. The harvest mouse has brownish fur with buff sides, a white belly, and an indistinct white stripe on the fur along the spine. Adults grow up to 11 to 17 centimetres (4.3 to 6.7 in) in length with a tail length of 5 to 10 centimetres (2.0 to 3.9 in). Their height (from the ground to the highest point of their back) is between 1.5 and 2.0 centimeters. A mature mouse weighs anywhere from 9 to 22 grams (0.32 to 0.78 oz). There is no sexual dimorphism in this species.
Similar species are the plains harvest mouse (Reithrodontomys montanus), which has a more distinct but narrower stripe on its spine, and the fulvous harvest mouse (R. fulvescens), which has a longer tail... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | San Diego | 🇺🇸 United States | |
| 2 | Los Angeles | 🇺🇸 United States | |
| 3 | San Francisco | 🇺🇸 United States |
| # | Zoo / Centre | Country | |
|---|---|---|---|
| 1 | New Forest Wildlife Park | 🇬🇧 United Kingdom |
Rare
Under 5% of wildlife watchers report a Western 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 Western Harvest Mouse in San Francisco on a given day, so our monthly data shows no clear season.
Among the best
Of the 3 cities where we can rate Western Harvest Mouse sightings, San Francisco ranks 3rd at under 5%, level with the leaders once rounded. The best odds are in San Diego (United States, under 5%) and Los Angeles (United States, under 5%).
GBIF citizen-science records
It is estimated from how often the Western 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.
