Myotis thysanodes (Fringed Bat)

Weight: 5-7 grams

Wingspan: 27-30 centimeters


Southcentral British Columbia, Canada, western United States, and most of Mexico.

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Ecology and Behavior:

The fringed bat occurs in a variety of habitats from desert-scrub to fir-pine associations. Oak and pinyon woodlands appear to be the most commonly used vegetative associations. Roost sites may be in caves, mines, and buildings. There are periodic changes in roost sites within a maternity roost because of thermoregulatory requirements of the bats; for example, clusters of bats move in response to temperature changes in different parts of the roost. Fringed bats are known to migrate, but little is known about the magnitude of movements. Females prepare physiologically for hibernation during the post-lactation period of late summer and early autumn, prior to migration. Individuals may awake from hibernation periodically throughout winter.

Food Habits:

Diet includes beetles and moths. These bats forage close to the vegetative canopy, and have relatively slow and highly maneuverable flight.

Reproduction and Longevity:

Mating takes place in autumn. Ovulation, fertilization, and implantation occur in late April and early May, and one baby is born in late June or early July. Birth occurs in a head-down posture. After parturition, newborn bats are placed in a cluster separate from adults. Adults then fly to the cluster of newborn, suckle their baby, and return to their original roost site.

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.