Western mastiff bat
- "Greater mastiff bat" redirects here. See Mops (bat) for the genus also known as "greater mastiff bats".
The western mastiff bat (Eumops perotis), also known as the western bonneted bat, the greater mastiff bat, or the greater bonneted bat, is a member of the free-tailed bat family, Molossidae. It is found in the Western United States, Mexico and South America, and is the largest bat native to North America. The subspecies Eumops perotis californicus is a species of concern as identified by the U.S. Fish and Wildlife Service. The range of this subspecies is principally southwest desert regions of the United States, along the border with Mexico; however, the range extends as far north on the Pacific coast to Alameda County, California.
The western mastiff bat has a body length of 5.5 to 7.5 in (14 to 19 cm) and a wingspan of over 22 in (56 cm). It has chocolate brown fur and thirty teeth. The body mass of this species can range from 60 to 70 g (2.1 to 2.5 oz).
The western mastiff bat needs at least 3 m (9.8 ft) of open space under its roosting spot for takeoff. Its echolocationary squeaks, which are inaudible to humans in most bats, can be heard from up to 300 m (980 ft) away. During the day they form colonies of less than 100. Unlike most North American bats, they do not undergo either migration or prolonged hibernation, but are periodically active all winter.
- Chiroptera Specialist Group 1996. Eumops perotis. 2008 IUCN Red List of Threatened Species. Downloaded on 26 October 2008
- Steven Moore, Endangered Species Survey for Water Treatment Plant Number Two of the Alameda County Water District, Earth Metrics Inc., published by the Alameda County Water District, Report number 10445.003, October, 1990
- Burt, William H. and Grossenheider, Richard P.; A field guide to Mammals; Huoghton Mifflin press, 1903: pg 45
- tpwd.state.tx.us; Accessed 2/28/07
- enature.com; Accessed 2/28/07
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