For many animals on the earth, the existence of natural enemies is undoubtedly a very scary thing. Therefore, on the long road of evolution, animals have adopted various survival strategies to avoid being troubled by natural enemies. For example, animals like elephants have evolved to a very large size, which will form a strong deterrent to potential predators, making them afraid to attack them easily.

For another example, animals like camels have evolved strong adaptability to harsh environments, so that they can live safely in areas that are difficult for predators to enter, while tigers Animals like lions and lions have evolved great strength and placed themselves at the top of the food chain in nature. Of course, they have no natural enemies.

What’s interesting is that in addition to these common strategies, some animals adopt very bizarre strategies. For example, sea spiders have spent 450 million years proving that as long as there is enough waste, there will be no natural enemies.

The sea spider is a Arthropods living in the ocean are called sea spiders because their appearance is very similar to spiders, but they are not spiders because from a taxonomic perspective, sea spiders belong to the category of "sea spiders". Class "Arachnida", while spiders belong to the "Class Arachnida".

Fossil evidence shows that sea spiders already existed in the earth’s oceans as early as the Cambrian period about 450 million years ago, but modern sea spiders have almost nothing compared with their ancient ancestors. Changes, what sea spiders looked like 450 million years ago, what modern sea spiders look like, they basically did not evolve over such a long period of time.

However, in the modern oceans of the earth, sea spiders are widely distributed, from the tropics to the frigid zone, from shallow seas to deep seas. They are found everywhere, which is enough to show that they are a successful species. , the survival strategy he adopted is very correct.

There are about 86 genera and more than 1,300 species of sea spiders on the earth. They range in size from large to small. Large ones can grow to dozens of centimeters, while small ones can only grow to a few centimeters. Millimeters, although different species of sea spiders vary greatly in size, their body structures are similar.

If you see a sea spider, it’s hard not to notice their legs, because their legs are so conspicuous that most of their body They are all legs, and relatively speaking, their heads and torsos can even be ignored.

The shape of sea spiders looks very unpalatable, but the actual situation is indeed like this. Their bodies are almost like a "skeleton", and the muscles and fat contained in them are extremely For predators in the ocean, once they eat it once, they will never have any interest in sea spiders again.

Yes, this is the survival strategy of sea spiders. For predators in the ocean, sea spiders are simply waste without any nutritional value, so they do not exist in nature. A natural enemy. So, how do sea spiders do it? The secret is in their legs.

According to biologists According to research, the legs of sea spiders are not just used for "walking". In fact, their legs also contain their digestive system, circulatory system, respiratory system, etc. In the vernacular, those originally Sea spiders have almost all the organs that support life activities that grow in the stomachs of other animals into their legs.

In short, the intestines of sea spiders extend to the legs in the form of blind tubes. While digesting, they can also use the peristalsis of the intestines to complete some functions of the circulatory system, and The overall shape of sea spiders also makes their body surface area relatively large, so they have no lungs or gills, and only need to obtain oxygen in the water through small holes on the surface of their legs.

This extremely simplified treatment means that sea spiders do not need to consume too much energy in their life activities. They only need a little food to survive, because they mainly feed on cnidarians in the ocean. , polychaetes, sponges, bryozoans and other marine organisms feed on them, and these organisms can be said to be everywhere in the ocean, so they are widespread in the earth's oceans.

It is worth mentioning that although the legs of sea spiders seem to be very developed, their movements are much slower than expected, and they look like slow motion in a movie.

In fact, there is no way for sea spiders. After all, they only have a little muscle. However, in the absence of natural enemies, just go slower and it will not affect their health. Survive. It is conceivable that if they want to move more flexibly, their muscles will grow more, but in this case, they are likely to attract predators.

As long as there is enough waste, there will be no natural enemies. Sea spiders have used 450 million years to prove that this weird survival strategy is actually feasible. I have to say that nature is really wonderful. What do you think? Woolen cloth?