Antrozous pallidus
Silhouette: Margot Michaud · PhyloPic
In 3 days ~20% in a week ~40%
The pallid bat (Antrozous pallidus) is a species of bat that ranges from western Canada to central Mexico. It is the sole species of its genus and is closely related to Van Gelder's bat (Bauerus dubiaquercus), which is sometimes included in Antrozous. Although it has in the past been placed in its own subfamily (Antrozoinae) or even family (Antrozoidae), it is now considered part of the subfamily Vespertilioninae and the tribe Antrozoini.
It is the state bat of California. Pallid bats have a head and body length of approximately 2.75 inches (6.2-7.9 cm), forearm length of approximately 2.1 inches (4.5–6 cm), a tail of approximately 1.75 inches (3.9-4.9 cm), and a wingspan of 15-16 inches (38–40 cm). They weigh 14-25 grams. These bats are large, with long forward pointing ears (over 2.5 cm). Fur is pale at the roots, brown on their back, with a light underside. Pallid bats have a blunt piglike snout. The dental formula for pallid bats is 1.1.1.32.1.2.3 × 2 = 28. The bacula of pallid bats are wedge or spade-shaped, generally with a short narrow base which widens and then tapers towards the tip. The bone also has a characteristic downward 'dip' around the midpoint, with... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Death Valley National Park | 🇺🇸 United States | |
| 2 | Sequoia and Kings Canyon National Parks | 🇺🇸 United States | |
| 3 | Big Bend National Park | 🇺🇸 United States |
No species of the same family or order lives in Big Bend National Park, so these are its closest relatives here: other mammals.
With luck
About 10% of wildlife watchers report a Pallid Bat sighting in Big Bend National Park on a given day, based on 11 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 17th most-seen of the 21 mammals we can rate there. Over three days the chance rises to about 20%, and over a week to about 40%, if each day is a fresh chance.
October
In that month about 20% of wildlife watchers report a Pallid Bat in Big Bend National Park on a given day, against under 5% in July and November–February, the lowest months.
Between 8 and 11 pm
Across all the parks we cover, that three-hour window holds the most Pallid Bat sightings with a recorded time, and about 6 in 10 of them come between 6 pm and 6 am: it is seen both by day and at night.
Among the best
Of the 3 parks where we can rate Pallid Bat sightings, Big Bend National Park ranks 3rd at about 10%, level with the leaders once rounded. The best odds are in Death Valley National Park (United States, about 10%) and Sequoia and Kings Canyon National Parks (United States, about 10%).
GBIF citizen-science records
It is estimated from how often the Pallid Bat is recorded against all the mammals logged in Big Bend National Park (11 verified sightings from 2019 to 2026), 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.
