 Their use of echolocation allows them to occupy a niche where there are often many insects (that come out at night since there are fewer predators then), less competition for food, and fewer species that may prey on the bats themselves.Echolocating bats generate ultrasound via the larynx and emit the sound through the open mouth or, much more rarely, the nose.The latter is most pronounced in the horseshoe bats ("Rhinolophus spp.