Egyptian fruit bat their days roosting in trees or caves, often with large groups of other bats, sometimes numbering in the thousands. They emerge from the roost to forage for food in the late evening, and return just before dawn. They hang upside down, with their wings folded closely around their bodies. Egyptian fruit bats, along with other species in the genus "Rousettus", are the only megachiropterid bats to use echolocation, which they accomplish by emitting a series of sharp clicks with their tongues. The clicks are normally slow and constant, but these clicks speed up dramatically when the bats approach an object.
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