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Starfish is a class of echinoderms, divided into two families: petrels and sea urchins. However, people commonly refer to it as starfish or "star fish". Starfish are mainly distributed on shallow seabed sandy areas or reefs around the world, and they are not unfamiliar to us. However, we know very little about its ecology. Sea stars do not look like animals, and from their appearance and slow movements, it is difficult to imagine that they are actually greedy carnivores that play an extraordinary role in marine ecosystems and biological evolution. Thats why it is widely distributed around the world. People generally believe that sharks are ferocious carnivores in the ocean. And who would have thought that starfish, which inhabit sandy or rocky seabeds and remain motionless, are also carnivores! But in reality, thats how it is. Due to the limited agility and speed of starfish, their main prey are slow-moving marine animals such as shellfish, sea urchins, crabs, and sea anemones. It often adopts a slow and meandering strategy when hunting, slowly approaching its prey, using its wrist tubes and legs to catch it and wrap its entire body around it. It spits out its stomach bag from its mouth and uses digestive enzymes to dissolve and absorb the prey outside its body. We know that starfish are an indispensable link in the marine food chain. Its predation plays a role in maintaining the balance of the biological community, for example, on the west coast of the United States, there is a species of sea star called the spiny starfish that often preys on the sea rainbow (Tancai) densely attached to the reef. This can prevent excessive reproduction of sea rainbows and prevent them from encroaching on the territories of other organisms, thus achieving the goal of maintaining the balance of the biological community. There are approximately 2000 species of starfish distributed in vast areas from the intertidal zone to the seabed worldwide. Among them, the species distributed the most in the northeastern Pacific waters from Alaska to California. Starfish, sea cucumber, and sea urchin belong to the same genus of echinoderms. They usually have five wrists, but there are also four or six, some as many as 40 wrists, and there are four rows of densely packed tube feet below these wrists. Using a tube foot can not only capture prey, but also allow oneself to climb rocks. Large starfish have thousands of tube feet. The mouth of a starfish is located in the middle of its lower body and can directly contact the surface of objects that starfish climb over. Starfish come in various sizes, ranging from 2.5 centimeters to 90 centimeters in size, and their body colors are also different. Almost every one has differences, with the most common colors being orange, red, purple, yellow, and cyan. In the natural food chain, there is often a struggle of life and death between predators and prey. In order to escape the predation of starfish, almost all prey animals can make an escape response. There is a type of sea cucumber that vigorously rolls in the water whenever a starfish touches it, and escapes before it is firmly grasped by the starfish. The technique of scallops avoiding starfish is also quite unique. When starfish approach them, scallops will quickly swim one by one. There is a type of small sea anemone that, whenever a starfish approaches it, detaches from the climbing reef, drifts with the curr
