The sirenian mammals or so-called herbivorous cetaceans, an order of educabilian placental <em>Mammalia</em>, having the body fish-like in form, with the hind limbs and pelvis more or less completely atrophied, and the body ending in a horizontal expansive tail, either rounded or like the flukes of a cetacean.
User Defined Definitions
"an animal order including: manatees; dugongs; Steller's sea cow"