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© Merlin D. Tuttle, BCI

Parastrellus hesperus

 canyon bat (Vespertilionidae)
 Parastrellus hesperus
 canyon bat

 Family Name: Vespertilionidae
 Genus: Parastrellus
 Species Name: hesperus

 Pronunciation: para-a-strell-lus hes-per-us
 Common Name: canyon bat

The canyon bat (formerly known as the western pipistrelle) occurs from Jalisco and Baja California, Mexico, northward to Washington, and from California eastward to southwestern Oklahoma. It is a bat common to the deserts, woodlands, and shrublands where it roosts day and night among boulders, or in cracks and crevices of rock faces. It has been suggested that canyon bats use burrows made by kangaroo rats (Dipodomys) and other rodents.

Canyon bats do not seem to migrate far and may stay in the same area year round. They probably hibernate in mines and caves during winter. Maternity colonies of up to a dozen individuals have been reported, but pregnant solitary females have also been found. Pregnant females and newborn have been observed in late July, early August.

Approximate Range

Source: IUCN Red List

To learn more, read about this bat in our BATS magazine archive:

How North America's Bats Survive the Winter

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