They usually stay near shallow water so if they are attacked they are less likely to be dragged under water for more than 15 minutes, thats how long they can hold there breath.
Boats
Mainly motorboats.
it has no natrual enemies
No. Manatees live in tropical and sub tropical regions, not in the Arctic.
Boats - propellers kill more manatees than any other predator.
They don't react to their enemies. They remain in shallow waters to avoid danger.
only speed boats and humans if not careful
yes they do, they are fish,and sharks,or whales.
they don't need to because they have no natural enemies
There are no natural enemies of the manatee for they do not share waters with sharks. One of the unnatural enemies are motor boats!
they escape their enemies by camouflaging with there surroundings!
the flies easily escape from their enemies because there are very small and they can fly so they can easily escape