Bat prevent them from spending too much time in unfamiliar places, and decrease predation. In some species, pregnant individuals may not use torpor. The smallest bat is Kitti's hog-nosed bat ("Craseonycteris thonglongyai"), which is long with a wingspan and weighs . It is also arguably the smallest extant species of mammal, next to the Etruscan shrew. The largest bats are a few species of "Pteropus" megabats and the giant golden-crowned flying fox, ("Acerodon jubatus"), which can weigh with a wingspan of . Larger bats tend to use lower frequencies and smaller bats higher for echolocation; high-frequency echolocation is better at detecting
Human echolocation role of a blind woman who must use echolocation to navigate the environment. In Naughty Dog's 2013 PlayStation 3 game, "The Last of Us", infected people called "clickers" use echolocation. In the 2012 movie "Imagine", the main character teaches echolocation to students at clinic for the visually impaired. This unconventional method spurs a controversy but helps students explore the world. Matthew Murdock is a defense attorney by day and a crime-fighting vigilante by night, going by the name "Daredevil", from Marvel Comics. He was involved in an accident as a child where his eyes came in contact with radioactive chemicals,