Tori and the Magnificent Manatees

When Tori discovers the friendly playful manatees in the river outside her home, she falls in love with them. Theyre awesome. They are said to be the only creatures on earth that have no natural enemies! But she sees scars on many of the gentle, slow-moving mammals. What is harming them? Why are they on the endangered species list? Why are they getting hurt? What can she and her friends do to help them?