Rhinolophidae or Horseshoe bats emit long and narrowband calls. Fluttering insect prey generates echoes in which amplitude and frequency shifts are present. i. e. https://www.lightemupsequences.com/quick-sale-2-5-Inch-By-10-Yard-Soft-Pink-And-Red-Damask-Dupioni-With-Red-Tinsel-Edge-Ribbon-super-value/