Lasiurus blossevillii (Western Red Bat)

Weight: 10-15 grams

Wingspan: 29-30 centimeters

[Call File Not Yet Available]



Western Canada, western United States, western Mexico, and Central America.


Ecology and Behavior:

This solitary species roosts in the foliage of large shrubs and trees in habitats bordering forests, rivers, cultivated fields, and urban areas. In the southwestern United States, the western red bat occurs in streamside habitats dominated by cottonwoods, oaks, sycamores, and walnuts, and rarely is found in desert habitats. In Mexico, it occurs in streamside, arid thorn scrub, and pine-oak forests. This species is believed to be migratory in much of the Southwest, and has been reported there only during summer months. There are various accounts of its presence during winter and summer in California. For example, the western red bat is resident through winter (September to May) in the vicinity of San Francisco, but absent in summer, and about 100 kilometers (60 miles) to the northeast it is absent in winter, but appears in February or March.

Food Habits:

The western red bat consumes a variety of moths and other insects.

Reproduction and Longevity:

Few data on reproductive biology are available. In mid-May to late June, up to three babies may be born.

Status of Populations:


Text, in its original form, provided by T. L. Best, M. J. Harvey, and J. S. Altenbach. Printed spectrographs provided by M. J. O'Farrell. Distribution maps, call descriptions, and AnaMusic sound clips produced by W. L. Gannon. Accounts assembled by T. C. Sanchez-Brown.