humans
Some manatee calves can be preyed on by crocodiles, alligators and sharks but their only significant predator is man. Recreational boat propellers account for many manatee injuries and deaths.
No manatees have no natural predators. They often do not get eaten. I have never heard of a manatee being eaten. So no
There are no natural enemies of the manatee for they do not share waters with sharks. One of the unnatural enemies are motor boats!
Most manatees are peaceful herbivores, grazing on seaweed on the ocean floor like a cow (which gives it the name "sea cow," for some far-fetched reason...).
Manatees have no animal predators, however man made crafts are one of the major problems in killing the sea creatures.
To tell the truth, manatees have not very many predators. In fact, the manatee is so large, humans are the only predators. We hunt them, hurt/kill them with our motorboats, and we scar/strangle them with our fishing boats. Also, our floodgates and pollution play a (not so) helping hand. Manatees' extinction will affect us because everyone loves a good trip to SeaWorld, or whatever zoo or aquarium you may visit, to see the manatees. Those blubbery, though loving, creatures will always (hopefully) keep a place in the human heart.
They have flippers to steer themselves and huge flat, spoon shaped tail fins to propel themselves. Their snouts are prehensile, like an elephant's trunk, allowing them to get at plants that grow at the bottom of the sea. Manatees are large enough that predators like sharks and alligators don't bother them. Manatees are also able to live in both fresh and salt water.
Manatees are consumers.
Manatees are made from God
yes manatees do exist
no one. manatees are docile.