Euderma maculatum (Spotted Bat)

Weight: 16-20 grams

Wingspan: 34-36 centimeters

[Call File Not Yet Available]



From southcentral British Columbia to southern Mexico.


Ecology and Behavior:

This spectacularly colored bat is white under-neath, and has black fur on its back with three large white spots. The spotted bat occurs in a wide range of habitats in the western regions of the continent, most often in rough, rocky, semi--arid, and arid terrain, varying from ponderosa pine forest to scrub country and open desert. The day roosts often are situated on high cliffs. These bats crawl with ease on both horizon-tal and vertical surfaces, which facilita-tes their movement in rock crevices where they roost. Spotted bats emerge about an hour after dark and return to the day roost about an hour before sunrise. They fly high, usually 10-15 meters (33-50 feet), at or above treetop height, and have a loud high-pit-ched echoloca-tion call that is clearly audible to the human observer at distances of 250 meters (825 feet) or more. Spotted bats may use a foraging strategy that involves hunting a regular circuit and searching clearings in pine forests for prey. These bats display a remark-able punctual-ity in making their rounds, arriving at various points along their route at the same time every night. In spring, they spend 3-5 minutes per clearing, but more time is spent around the same area in summer.

Food Habits:

Diet consists primarily of moths.

Reproduction and Longevity:

One baby is born in June. When born, babies lack the color pattern of adults and weigh about 4 grams.

Status of Populations:

One of the rarest bats in North America.

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.