Starfish are colorful and have many colors. The body consists of a central disk and a wrist extending from it. The number of wrists is generally 5, and some can reach more than 20. Their central body disk is slightly convex on the back, concave on the ventral surface and has a mouth.

Starfish have magical regeneration ability. No matter whether a wrist is cut off or bitten off by other animals, a new wrist will soon grow. The sand starfish with strong regeneration ability can generate a complete new starfish as long as they have a wrist with a length of 1 cm, which means that cutting them into several pieces will help them add several new members.

Only by hanging them on land can they never be resurrected. Starfish are very greedy and eat a lot. A starfish larva eats more than half its own weight in a day. Whenever they find prey such as clams, they will catch them, with their shells facing down and their stomachs facing up.

For example, a sand starfish can grow a complete new starfish by keeping its wrist one centimeter long, while some starfish are more capable, and a complete new starfish can grow with only one residual arm. Starfish can regenerate naturally after their wrists and body plates are damaged or cut by themselves. Any part of starfish can regenerate new starfish? .