melon melonlipid-filled sac in the forehead of whales that helps to focus sound Related Articles: Glossary: click trainFeatured Sound: Beluga WhaleHearing in Cetaceans and Sirenians, the Fully Aquatic EarHow did odontocete hearing evolve?Beluga Whale, White WhaleTutorial: Sonar SourceCommon DolphinSonarMelon-headed whalePilot Whale Chris Knowlton2017-02-26T20:09:59-05:00