- sea cow, sirenian mammal, sirenian - any of two families of large herbivorous aquatic mammals with paddle-shaped tails and flipper-like forelimbs and no hind limbs
--1 is a kind of aquatic mammal
--1 is a member of Sirenia, order Sirenia
--1 has particulars:manatee, Trichechus manatus; dugong, Dugong dugon; Steller's sea cow, Hydrodamalis gigas