What would happen if there were no manatees?

Answer 1

There would be an over population of certain animals that consist in their diets, like squid, crabs and snails. They are primarily bottom feeders, so whatever is on the bottom of the ocean floor...they eat

Answer 2

Then the entire eco-system would become unbalanced and everything would be unproportioned. Sharks are not bad, sharks are beeeautiful ♥

Answer 3

The world would loose another animal that is harmless and adds to the environment. Very sad.