Sirenians are a group of marine mammals that includes manatees and dugongs. Synonyms for sirenian can include sea cow, marine cow, or even mermaid. These animals are known for their gentle nature and their slow-moving habits. They are herbivores and can often be found grazing on seagrass or other aquatic vegetation. While they may seem docile and harmless, sirenians are actually at risk due to habitat loss, hunting, and collisions with boats. Efforts are being made to protect these creatures and to ensure that they can continue to thrive in their natural habitats. If you ever have the chance to see a sirenian up close, consider yourself lucky to witness one of the ocean's gentle giants.