The Western pipistrelle is one of the smallest bats in the United States weighing in at 3-6 grams. Their wingspan measures 7-9 inches (19-23 cm). These bats are distinguished from the myotis species by their blunt and curved tragus.
These bats range from southern Washington to southern Mexico in the western United States. They do not extend farther east than the Rockies.
They are widely distributed in Utah.
Ecology and Behavior
The Western pipistrelle tends to be one of the first bat species seen foraging at dusk. These bats are slow fliers and their flight is erratic. They eat moths, flies, mosquitos, ants and sometimes wasps.
They will roost in crevices, under rocks, in caves and mines, buildings, or occasionally in the burrows of other animals.
Red dots indicate captures prior to 2009 and yellow dots indicate captures after 2009. The yellow line separates the Great Basin ecoregion on the left from the southern Rockies region on the right.
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