If you think rock concerts are loud, you should hear the bats. Anarticle published in the open-access journal PLoS ONEfinds that bats emit sounds that are above the human thresholdof pain.Researcher Annemarie Surlykke (Institute of Biology, SDU, Denmark) andher colleague Elisabeth Kalko (University of Ulm, Germany) investigatedthe patterns and behavior of echolocation in 11 species ofinsect-eating tropical bats from Panamá.