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nounany of two families of large herbivorous aquatic mammals with paddle-shaped tails and flipper-like forelimbs and no hind limbs
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Definition that contains sirenian
- manatee sirenian mammal of tropical coastal waters of America; the flat tail is rounded
- dugong sirenian tusked mammal found from eastern Africa to Australia; the flat tail is bilobate
- trichechus manatus sirenian mammal of tropical coastal waters of America; the flat tail is rounded
- dugong dugon sirenian tusked mammal found from eastern Africa to Australia; the flat tail is bilobate