Manatee

Sirenas are marine mammals that are large slow moving creatures with streamlined body, which are the only marine mammals that feed purely on plants. They must rise to the surface to breath, but they can remain submerged for 20 minutes. They have no enemies apart from human beings. Sirenas number around 130,000  which is any mammal order. The main difference between manatee and dugong is their tails.

   Manatee