The marine creature that is often nicknamed "sea cow" is the manatee. Manatees are large, herbivorous aquatic mammals that are known for their slow, gentle behavior and herbivorous diet. They are sometimes referred to as sea cows due to their size, grazing habits, and somewhat placid nature. Manatees are primarily found in warm coastal waters, estuaries, and rivers in various parts of the world, including the Caribbean, Florida, West Africa, and the Amazon River. They are herbivores, feeding on aquatic plants and vegetation, and are known for their conservation status and the need to protect their habitats.