Sirenia is an order of marine mammals that includes species commonly known as manatees and dugongs. These gentle creatures are herbivorous, primarily feeding on aquatic plants. Sirenians are characterized by their large, streamlined bodies and paddle-like flippers, which help them navigate through water. Sirenia is unique among marine mammals as they are the only group that is fully adapted to a herbivorous diet in aquatic environments. They inhabit warm coastal waters and rivers, primarily in tropical and subtropical regions. Conservation efforts are crucial for their survival, as many species face threats from habitat loss and human activities.