The starfish is an animal that lives in the ocean. Many people think that they are inactive, but starfish are active, but they are not active very often, and their speed is very slow. Because starfish have no feet, many people are curious about the way starfish move. When starfish are active, their ventral surface is the side near the bottom of the sea, using a crawling way. When moving, the starfish does not rely directly on its five arms, but on a number of brachiopods, or "tube feet", distributed below. The number of these tube feet is very large, depending on their peristaltic starfish can be mobile.
However, the overall speed of starfish activity is very slow. Researchers have studied the speed of starfish movement, and found that some starfish can only crawl about 10 centimeters per minute, fast time can reach about 20 centimeters; There are also some species of starfish that are faster on their own, but slower than other animals in the ocean. Therefore, although starfish feed on the surrounding marine animals, they can not prey on fast animals, but can only eat some of the same slow-moving organisms, such as shellfish.
As mentioned above, starfish move by crawling. In the process of crawling, they rely on a special structure in their body, called "tubular feet". These tubular feet are numerous and grow below each of their horns. In the process of starfish activity, these tubular feet will wriggle, driving the starfish to crawl forward. Of course, this kind of movement is relatively slow.
