Facebook post by University of Helsinki Julkaistu 14.11.2020 klo 11:50 University of Helsinki kirjoitti Facebookissa New technology has allowed humans to hear animal sounds that we have earlier been unable to detect. The infrasound elephants emit while communicating with each other could be identified in a recording only in the laboratory. Animals communicate in frequencies that we cannot hear | University of Helsinki l.facebook.com What do the giraffe, the elephant, the dolphin, and the bat say?