Myotis evotis (Western Long-eared Bat)

Weight: 5-8 grams

Wingspan: 25-29 centimeters


Western Canada, western United States, and Baja California, Mexico.

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Ecology and Behavior:

Occurs in a variety of habitats over its range in North America, but mostly in forested areas. In the Pacific Northwest and British Columbia, for example, it occurs from dry forest to subalpine forest, especially where broken rock outcroppings prevail. Where suitable roosting sites are available, this species also is found in semiarid shrublands, sage, chaparral, and agricultural areas. Females form small maternity colonies in summer, whereas males and non-pregnant females live singly or in small groups, occasionally occupying the same site as a maternity colony, but roosting apart from it. Groups of 12-30 individuals have been found in roosts. Daytime roosts are known to include abandoned buildings, hollow trees, loose slabs of bark, timbers of unused railroad trestles, caves and mines, fissures of cliffs, and sink holes. This species emerges at dusk, and its flight is slow and maneuverable as it forages between and within the treetops and over woodland ponds. Predators may include snakes, raccoons, hawks, and owls. females.

Food Habits:

Foods include moths, beetles, flies, net-winged insects, and true bugs. Males eat significantly more moths than do females.

Reproduction and Longevity:

One baby is born in late June or early July. Record lifespan is 22 years.

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.