Animal echolocation in the external ear. There are two hypotheses about the evolution of echolocation in bats. The first suggests that laryngeal echolocation evolved twice in Chiroptera, once in the Yangochiroptera and once in the horseshoe bats (Rhinolophidae). The second proposes that laryngeal echolocation had a single origin in Chiroptera, was subsequently lost in the family Pteropodidae (all megabats), and later evolved as a system of tongue-clicking in the genus "Rousettus". Individual bat species echolocate within specific frequency ranges that suit their environment and prey types. This has sometimes been used by researchers to identify bats flying in an area simply by
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