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
Echolocation jamming chemicals from their host plants as caterpillars and keep them in their tissues through adulthood. Roeder agreed with Dunning’s findings. James Fullard and colleagues published findings in 1979, and 1994 arguing in favor of the jamming hypothesis based on the acoustic characteristics of moth clicks, however this hypothesis was still widely debated in the literature during that time. In the 1990s experiments were conducted broadcasting clicks to bats performing echolocation tasks on a platform and with neurophysiological methods to demonstrate a plausible mechanism for jamming. The researchers concluded that most tiger moths do not produce enough sound to jam bat