Manatees are very cool and exciting animals but they are endangered the main reasons why are that they coloide with boats and that is 20% of their deaths. Also 1,101 manatees died from habitat loss and degradation.
Manatees deserve a good environment to live in but they don't get that. Out of 300 million tons 14 million tons of trash and other junk get dropped in the water. Also they get tangled in fishing nets/gear, most people harass manatees and dont watch out for them.
With everything that goes into the water it poisons plants and Manatees could die. The main plant that kills Manatees are the red tide ,and other harmful algal blooms. Also climate change is harmful to Manatees climate change causes cold snaps and the loss of warm water is the greatest long term threat.
For more info on threats to manatees