Megabat evolved early in the lineage of chiropterans. Although echolocation was later lost in family Pteropodidae, bats in the genus "Rousettus" are capable of primitive echolocation through clicking their tongues, and some species have been shown to create clicks similar to those of echolocating bats using their wings. Both echolocation and flight are energetically expensive processes. The nature of the flight and echolocation mechanism of bats allows for creation of echolocation pulses with minimal energy use. Energetic coupling of these two processes is thought to have allowed for both energetically expensive processes to evolve in bats. The loss of echolocation may
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