We should all have seen crabs? Crabs walk horizontally. We should all know that. So why do crabs walk horizontally? Today, let's have a look with Sihai.
Why do crabs walk horizontally? Why do crabs run wild
The head and chest of a crab cannot be distinguished from each other in appearance, so it is called head chest. The animal has full feet on both sides of its body. The first pair of pincers is not only a tool for digging holes, but also a weapon for defense and attack. The other four pairs are used for walking, called walking feet. Each foot consists of seven joints, and the joints can only move up and down.
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The chest width of most crabs is greater than the length. Therefore, when crawling, they can only bend one foot, grasp the ground with the tip of the foot, and extend the other foot outward. When the tip of the foot reaches the ground far away, it begins to contract, while the original bent foot straightens out immediately, pushing the body to the opposite side. Because these pairs of feet are different in length, the crab actually moves to the side forward.
However, not all crabs can only traverse. For example, groups of long armed monk crabs living on the beach can run forward. Many spiders and crabs living in seaweed can also climb vertically on seaweed.
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