sirenians sireniansgroup of mammals that includes manatees and dugongs Related Articles: Audio GalleryHearing in Cetaceans and Sirenians, the Fully Aquatic EarMedia BackgrounderTutorial: Can Animals Sense These Sounds Part IDugong (Dugong Dugon)Marine MammalogistFacts and Myths Chris Knowlton2017-02-26T20:10:01-05:00