As early as 600 million years ago, sea cucumber has lived on the earth and is one of the most successful animals on the earth. We know that when a skunk is in danger, it will spit out an unpleasant liquid from its smelly glands and smear it on its body, making its enemies sick. In order to avoid the enemy's harm, sea cucumber has evolved a more delicious defense mechanism than skunks.
Once the sea cucumber is in danger, its body will be squeezed quickly, and then its intestines and other internal organs will be ejected from the anus. Without understanding, the attacker easily thought that the dirty thing was the body of sea cucumber, so he rushed up and took a bite, and the result was entangled in the internal organs and intestines. By the time the enemy found out something was wrong, it was too late and the body was filthy. The sea cucumber has already taken the opportunity to run away and disappeared. What is even more frightening is that some sea cucumbers contain toxic chemicals in their intestines, and many animals are not only disgusted, but also may be poisoned to death.
For sea cucumber, the absence of viscera and intestines does not affect its life span. These organs have the function of regeneration. After about 6 weeks, the new organs will grow well. Although the viscera of sea cucumber is filthy, it is delicious to some fish. There is a kind of fish in the sea called diving fish, which likes to eat the viscera of sea cucumbers.
The cylindrical body of sea cucumber is covered with thorns and looks like cucumber. This limp 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. After the sea cucumber loses its internal organs, it will grow its internal organs again after several weeks of rest. With this superb skill, sea cucumber can escape from the enemy and protect itself.
The relationship between Tibetan fish and sea cucumber is "profitable" Usually, the hidden fish feed in the sea, and when it is in danger, it will "hide" into the sea cucumber to avoid danger and feed on some organs of the sea cucumber. Because the viscera of sea cucumber has the function of regeneration and does not lose money, it has temporarily become the landlord of Tibetan fish.