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) Vampire Bats (film) Vampire Bats is a 2005 adventure-horror film directed by Eric Bross and starring Lucy Lawless. The film is a sequel to the 2005 film "Locusts". In a Louisiana city, near a bayou, a plague of genetically mutated bats begins to kill the people, then Dr. Maddy Rierdon and her students from colleges work together to kill the bats before the whole city is destroyed. The film begins with an abandoned house, inhabited by a group of vampire bats, which seem to be mutations of the local population. Later, in the forests nearby, people begin to find many