An order of large aquatic plant-eating mammals which includes the manatees and dugong. They live chiefly in tropical coastal waters and are distinguished by paddle-like forelimbs and a tail flipper replacing hindlimbs.
- Order Sirenia: two families and four living species
- Belonging to the order Sirenia, dugongs are believed to have given rise to the mermaid myth.
- Marine mammals are divided into three orders: Carnivora, Sirenia and Cetacea.
- Dugongs belong to the mammalian order Sirenia and are popularly known as sea-cows.
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