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Dugong and Mantees belong in the Sirena family.
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They are the only mammals to feed on grasses and plants in shallow waters.
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Sea Grasses are much less than terristial grasses.
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The four living species are all found in warm waters of tropical and subtropical regions.
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The dugong is restricted to the sea waters only.
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The Amazonian Manatee is found only in freshwater of Amazon River.
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There are five species of manatees.
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They are Amazonian, Caribbean, West African, and West Indian manatee.
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There is one species of dugong.
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They are found only in Australia.
WEST INDIAN MANATEE 
WEST AFRICAN MANATEE