sirenians sireniansgroup of mammals that includes manatees and dugongs Related Articles: Hearing Sensitivity StudiesAudio GalleryHearing in Cetaceans and Sirenians, the Fully Aquatic EarMedia BackgrounderTutorial: Can Animals Sense These Sounds Part IMarine MammalogistFacts and Myths Chris Knowlton2017-02-26T20:10:01-05:00