Nycticeius humeralis
Silhouette: Margot Michaud · PhyloPic
In 3 days ~10% in a week ~20%
The evening bat (Nycticeius humeralis) is a species of bat in the vesper bat family that is native to North America. Hunting at night, they eat beetles, moths, and other flying insects. The evening bat is a small bat weighing 7–15 g (0.25–0.53 oz) found throughout much of the midwestern and eastern United States. Their forearms are 34–38 mm (1.3–1.5 in) in length. The tip of each dorsal hair is a light gray, and one to two-thirds of the basal is dark brown. Though there have been some cases of white pelage, the majority of the population is mostly brown in color. They have wide, dog-like muzzles, pronounced facial glands, and disproportionately large bacula. Evening bats can be mistaken for juvenile big brown bats, due to their physical resemblance but smaller size.
Evening bats have relatively robust jaws, compared to other insectivorous bats. They have an unkeeled calcar and a short, round tragus. The curvature of the tragus helps distinguish it from bats of the genus Myotis, which otherwise look very similar. Their skull has one upper incisor on each side with 4 molariform teeth.
The evening bat is a relatively short-lived, especially... Wikipedia →
Recording0:16
United States · 2023
© kcdavi01 · iNaturalist · CC BY-NC 4.0
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Austin | 🇺🇸 United States | |
| 2 | San Antonio | 🇺🇸 United States | |
| 3 | Dallas | 🇺🇸 United States | |
| 4 | Houston | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report an Evening Bat sighting in San Antonio on a given day, based on 9 verified sightings from GBIF citizen-science data. It is the 17th most-seen of the 17 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.
Any time of year
In every month with enough records, under 5% of wildlife watchers report an Evening Bat in San Antonio on a given day, so our monthly data shows no clear season.
Between 7 and 10 pm
Across all the parks we cover, that three-hour window holds the most Evening Bat sightings with a recorded time, and about 6 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 4 cities where we can rate Evening Bat sightings, San Antonio ranks 2nd at under 5%, level with the leaders once rounded. The best odds are in Austin (United States, under 5%).
GBIF citizen-science records
It is estimated from how often the Evening Bat is recorded against all the mammals logged in San Antonio (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.
