Western Mastiff Bat, Eumops perotis

The western mastiff bat, the largest native bat to North America, can be found in the western United States, South America, and Mexico. Other common names for this bat are the greater mastiff bat, the greater bonneted bat, and the western bonneted bat. Although one subspecies of this bat has a conservation status of concern (Eumops perotis californicus), the western mastiff bat is listed as of least concern by the Fish and Wildlife Service.

This western mastiff bat is dark brown in color, and has thirty teeth. Its wingspan is over twenty-two inches long, and the average body length of this bat can be up to 7.5 inches.  Using echolocation that can be heard from 980 feet away (although not by humans), it will fly and hunt for food. It has a main diet of moths, which comprise eighty percent of the entire diet. The bat will often go to the ground to forage for food, and its tail will stick straight up. In order for the bat to take off, it must have at least 9.8 feet of free space under its roost.  The western mastiff bat does not hibernate, nor does it migrate like most other North American bats. Instead, it is active throughout the winter season.

Image Caption: Western Mastiff Bat, Eumops perotis. Credit: Wikipedia