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Yuma Myotis Myotis yumanensis


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Yuma Myotis, with prey
credit: J.N. Stuart/CCSA

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Family: Vespertilionidae, Vespertilionid Bats view all from this family

Description Medium-sized Myotis with short ears (extend less than 2mm beyond nose when bent forward), and an unkeeled calcar. Very similar to the Little Brown Myotis, but the Yuma Myotis is slightly smaller, with less glossy fur, and paler ears. Skull shows a more abruptly ascending forehead than the Little Brown Myotis. Forearm 30-38mm.

Dimensions 75-89mm, 29-43mm, 4-7g

Warning Bats are susceptible to rabies, a serious viral disease that results in death if untreated. Rabid bats rarely attack humans or other animals, but bats found lying on the ground may be rabid. Never touch or pick up any bat. Stay away from any animal that seems to be acting strangely and report it to animal-control officers. If you are bitten by a possibly rabid animal, you must immediately consult a doctor for a series of injections; there is no cure once symptoms emerge.

Habitat Canyons & caves, Deserts, Lakes, ponds, rivers & streams

Range Rocky Mountains, Southwest, Texas, California, Northwest, Western Canada

Discussion Active at dusk, they are frequently seen foraging low over or near open water in valleys of western mountains. They are less active in the middle of the night, although sometimes they forage again just before dawn, primarily feeding on moths and flies. Commonly found in desert areas, but never far from water sources. They lack special adaptations to desert habitats and quickly dehydrate if kept from water. Summer roosts are found in buildings, under bridges, in crevices of cliffs, and in caves and mines throughout the southwest.