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plural sirenians
(zoology) Any of a group of aquatic, herbivorous mammals, of the order Sirenia, including the manatees and dugong. quotations
The cetaceans (whales and dolphins) together with the sirenians (sea cows and manatees) are the sea mammals best-adapted to the seas of today, but it is the cetaceans that have most engaged the attention of mankind as both prey and fellow sentient being.
2011 September 22, Richard Shelton, “Sheep, pig, whale”, in Times Literary Supplement