Lasiurus frantzii
Silhouette: CJ Campbell · PhyloPic
In 3 days ~10%
The western red bat or desert red bat (Lasiurus frantzii) is a species of microbat in the family Vespertilionidae. It is found in western North America and Central America. Previously, it was believed to be a subspecies of the southern red bat (Lasiurus blossevillii), and was called Lasiurus blossevillii teliotis (abbreviated L. b. teliotis). The western red bat is also very similar to the eastern red bat and is distinguished from each other by minor differences, such as the lack of white-tipped hair in the dorsal pelage in the western red bat and the presence of sparse fur in the lower third of their tail. Their habitats are separated by the Rocky Mountains and may overlap.
The western red bat is found across western North America, ranging from southern Canada, through the western United States, down to Central America. The species has been recorded in Belize, Canada, Costa Rica, El Salvador, Guatemala, Honduras, Mexico, Nicaragua, Panama, and the United States. This species, along with most other Lasiurus, is a migratory species. It migrates to the southern parts of the Americas in the winter, and migrates north in the summer. Lasiurus... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Monteverde Cloud Forest Reserve | 🇨🇷 Costa Rica |
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | San José | 🇨🇷 Costa Rica | |
| 2 | San Francisco | 🇺🇸 United States | |
| 3 | San Diego | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report a Western red bat sighting in San Francisco on a given day, based on 10 verified sightings from GBIF citizen-science data. It is the 32nd 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 red bat in San Francisco on a given day, so our monthly data shows no clear season.
Between 10 am and 1 pm
Across all the parks we cover, that three-hour window holds the most Western red bat sightings with a recorded time, and about 7 in 10 of them come between 6 am and 6 pm: it is seen both by day and at night.
Among the best
Of the 3 cities where we can rate Western red bat sightings, San Francisco ranks 2nd at under 5%, level with the leaders once rounded. The best odds are in San José (Costa Rica, under 5%).
GBIF citizen-science records
It is estimated from how often the Western red bat is recorded against all the mammals logged in San Francisco (10 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.
