Dugong and Mantees belong in the Sirena family.

They are the only mammals to feed on grasses and plants in shallow waters. 

Sea Grasses are much less than terristial grasses.

The four living species are all found in warm waters of tropical and subtropical regions.

The dugong is restricted to the sea waters only.

The Amazonian Manatee is found only in freshwater of Amazon River.

There are five species of manatees.

They are Amazonian, Caribbean, West African, and West Indian manatee.

There is one species of dugong.

They are found only in Australia.