Sea stars, also known as starfish, are fascinating marine animals found in oceans around the world. They typically have five arms, but some species can have many more. Sea stars come in various colors and sizes, making them a beautiful sight on the ocean floor. They are not actually fish; instead, they belong to a group called echinoderms, which also includes sea urchins and sand dollars. These creatures are known for their unique ability to regenerate lost arms. If a sea star loses an arm, it can grow a new one over time. Sea stars are also important for their role in the ecosystem, as they help control populations of mollusks and other marine organisms.