The cylindrical body of sea cucumber is covered with thorns and looks like cucumber. This soft body has no powerful self-defense weapon and no ability to swim quickly. It can only rely on the contraction of the abdominal tube foot and muscles, and it is difficult to resist the enemy's attack. Although it looks strange, it occasionally scares each other and likes to hide in the cracks of rocks, but because it is weak and incompetent, it will inevitably be attacked by other marine animals. However, sea cucumbers have their own protection methods. Sea cucumber will play "separation" when it can't get rid of the enemy's attack. Through the intense contraction of the body, the internal organs are quickly thrown from the anus to the enemy, turning harm into benefit.