Could whistles deter bats from hitting wind turbines? Could loudspeakers keep eagles away? Those were two of the techniques proposed at the 177th Meeting of the Acoustical Society of America in Louisville, Kentucky. Researchers from Texas A&M University in College Station explored using a passive acoustic whistle, modeled from a bat’s larynx, mounted on turbine blades to warn away bats. University of Minnesota researchers are testing if speakers blasting sounds, including the calls of mobbing crows, will keep eagles from flying into wind turbines.