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
Vampire Bats (film) more student is killed in the pool by the bats. Maddy rushes to find a solution while learning that the bats' mutation is an indirect result of toxic waste that contaminated the local water source, creating mutations in the deer that the bats feed on, thus making the bats too mutants. Meanwhile another group of bats is found in a church (yet still not the whole population). Maddy's students accidentally find out that the bats are attracted to loudspeakers or anything that emits sounds similarly, as they mistake those sounds as reflected ultrasounds. They decide to set a trap in