Smithsonian National Museum of Natural History, North American Mammals
Search the Archive

  Chiroptera · Molossidae · Eumops perotis
  Smithsonian Institution
  Copyright Notice
  Privacy Notice
 
Eumops perotis

Greater Bonneted Bat

Order: Chiroptera
Family: Molossidae

sound   Click to play (0:10, 870 kb)
Credit: New Mexico Bat Call Library, W. L. Gannon
Image of Eumops perotis
Eumops perotis - upper left (with E. underwoodi)
Click to enlarge. (78 kb)

Conservation Status: Least Concern.


Greater Bonneted Bats live in rugged, rocky canyons typical of the arid Southwest, where they inhabit crevices in vertical cliffs. Because of their relatively large body size and narrow wings, these bats are unable to take off from a flat surface, and must instead freefall from a height to initiate flight. Hanging upside-down in a crevice, it can let go, gain airspeed as it drops, and flap away for its nightly hunt for insect prey. If an individual is on the ground, it will scramble up a tree or other object to get high enough to be able to launch itself into flight. In the early 1900s, they often roosted in buildings in southern California, but this may not be the case today.

Also known as:
Greater Mastiff Bat, Bonnetted Bat, Western Mastiff Bat

Sexual Dimorphism:
Males are larger than females.

Length:
Average: 175 mm
Range: 159-187 mm

Weight:
Range: 45.5-73 g

References:

Schinz, H.R., 1821.  Das Thierreich eingetheilt nach dem Bau der Thiere als Grundlage ihrer Naturgeschichte und der vergleichenden Anatomie von dem Herrn Ritter von Cuvier,  Stuttgart, Germany, 1:870.

Links:

Mammal Species of the World

Mammalian Species, American Society of Mammalogists' species account

Distribution of Eumops perotis

Image of Eumops perotis
Click to enlarge. (132kb)