Smithsonian National Museum of Natural History, North American Mammals
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  Chiroptera · Vespertilionidae · Myotis occultus
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Myotis occultus

Arizona Myotis

Order: Chiroptera
Family: Vespertilionidae

 

Conservation Status: Least Concern.


This small bat's long, silky fur can vary in color from blackish-brown to yellowish-gold. Its tail is almost completely within the tail membrane (also called the "interfemoral membrane" or "uropatagium"); only the tip of the tail extends beyond it. Like other myotis, these bats feed on flying insects. They are most often seen hunting over water around dawn or soon after dusk.

Two types of colonies have been reported: maternity colonies, where females give birth and raise their young (usually one, but twins have been reported), and mixed-sex colonies. The bats frequently shelter in caves, but also use buildings.

This species is considered rare in Mexico, where it is only known from dry, grassy or shrubby habitats and pine and oak forests at elevations of 2250-2700 m. Pesticide use has impacted populations in the US.

Length:
Range: Total Length: 41-54 mm; Tail: 29-41 mm

Weight:
Average: 7 g

References:

Hollister, N., 1909. Proceedings of the Biological Society of Washington, 22: 43.

Links:

Mammal Species of the World

Distribution of Myotis occultus