A variety of bats (such as big brown, Townsend’s big-eared, Mexican free-tailed, and several species of myotis) make the Great Basin their home while bat species in general make up 20% of the world’s mammals. The only mammals capable of true flight, bats have wings that are supported by bones that are structurally equivalent to the bones in our hands.The majority of bats are insectivores; bats of some species can eat over 600 mosquitoes in just one hour! Most bats find their food in flight using echolocation, a form of sonar.