 However, this adaptation of echolocation calls to ecological factors is constrained by the phylogenetic relationship of the bats, leading to a process known as descent with modification, and resulting in the diversity of the Chiroptera today.Flying insects are a common source of food for echolocating bats and some insects (moths in particular) can hear the calls of predatory bats.There is evidence that moth hearing has evolved in response to bat echolocation to avoid capture.