Thirty meters under the sea, a fierce battle is underway.

Bi Fang grabbed the rock wall and stabilized his figure, the two figures had almost disappeared from his perception range, and even if they appeared occasionally, they were only fleeting.

In ancient Greece, harming dolphins was punishable by death.

This is so because there is no shortage of stories in history that resemble dolphins saving people.

Mandy is one of those who has experienced this, as three years ago he was surfing the east coast of Australia with a group of friends when a tiger shark hid in the middle of a second wave.

It is one of the most ferocious sharks in the ocean, a ferocious and cruel carnivore second only to man-eating sharks in the shark family, and the largest known member of its family.

The maximum body length can reach nearly eight meters!

Eight meters, which is almost the length of a small van truck.

They hunt a variety of marine fish, mammals, seabirds, turtles and even people, and are known as "tigers of the sea".

They are ferocious and voracious, with a wide snout like a shovel and teeth like a steak knife.

Because of the tiger-like pattern on the body, it has the name Tiger Shark.

Mandy certainly didn't meet eight meters, but it definitely exceeded five meters, much longer than a normal car.

At that time, the pattern of the tiger shark was mixed with the wave pattern that reflected the sunlight, and it sparkled with a unique light.

It sprinted towards Mandy, quickly coming into range.

Bi Fang wanted to know what Mandy was thinking at that time, maybe his legs were so weak that he was about to fall off the surfboard,

With less than two meters of each other, Mandy's fingers ran across the waves, refracted by the sunlight, as if they were touching the skin of a shark.

He looked down like he was looking at a shark specimen in a glass display case, and soon, he would be one of them.

Just then, a dolphin jumped out and knocked the tiger shark away from the side, driving it away.

At that moment, Mandy felt the strongest connection with animals in her life, so much so that three years later, she still enjoys telling this story to everyone.

At that moment, at this moment.

The battle between the cow trevally and the dolphin has long been a foregone conclusion in Bi Fang's mind.

The dolphins are bound to win.

Comparing the numbers alone, the trevally is far from an opponent.

The speed of the trevally can reach 60 kilometers per hour, but the dolphin can reach an even more terrifying 70 kilometers per second, close to 20 meters per second, and the limit can reach 80 kilometers per second, 22 meters per second.

In fact, some scientists once believed that according to the characteristics and shape of the dolphin, it could not swim faster than 20 km/h.

If a dolphin swims faster than its muscles can handle, this can only be achieved in the following two cases:

One is that dolphins' muscles are supernaturally efficient, 6 times stronger than the average mammal.

The second is that it uses some kind of peculiar method to reduce resistance.

This hypothesis was put forward in 1936 by Zhan Gray, an expert in aquatic animal research in the central government, and this theory is called the "Gray Strange Theory".

Dolphins don't have any special muscles, which quickly became apparent, and certainly not supernatural efficiency.

Therefore, according to the current speculation, it must be the second cause of the dolphin's high-speed swimming.

Is it a form? There is speculation.

Not really.

Scientists have created a model of a dolphin that is indistinguishable from a real dolphin in terms of size and surface, with thrusters on the model that are the same as those generated by the dolphin's tail fin.

The results of the experiment were disappointing, and it was much slower than the dolphin's speed.

Later, after further research by many physical biologists, it was found that the skin of dolphins is divided into two layers, the upper layer is the outer layer, which is very elastic; The lower layer, which is the inner layer, also has good elasticity.

When the upper layer of skin is subjected to the pressure of water, it becomes uneven depending on the degree of water pressure.

When the dolphin enters high speed, the turbulence caused by the body's vibrations is adjusted to the uneven changes in the skin, which greatly reduces drag.

Extremely magical.

In addition, dolphins may seem cute, but they firmly occupy the top of the marine food chain, and their combat power is stronger than most people think.

Sharks are the most ferocious fish in the ocean, known as the "wolf of the sea", living on injured marine mammals, fish and carrion, eliminating the weaker members of the animal, and have few opponents in the ocean, but the ferocious shark rarely attacks dolphins.

Fish are afraid of sharks, whereas sharks are afraid of dolphins.

Small dolphins are fast and nimble, allowing them to easily dodge shark attacks. It's hard for a shark to bite a dolphin, but it's easy for a dolphin to attack a shark.

Large dolphins are not as agile, but their strong bodies can knock sharks over on their backs.

You should know that once a shark is knocked over, it will fall into a "catatonic stillness" and fall asleep.

And in taxonomy, sharks belong to the subclass Platel Gill of the class Cartilaginous Fishes.

Their bones are made of cartilage and connective tissue, and although they are elastic and durable, they are much less dense and harder than true hard bones.

In addition, sharks do not have ribs, so the lower side of the body and the abdomen are the weakest points of their whole body.

Dolphins, on the other hand, are aquatic mammals with hard upper and lower jawbones and a protruding snout like a sharp spear.

When the two really start a life-and-death fight, the dolphin will not let go of the shark's weakness.

It's like stabbing your fingers through damp window paper – with the right speed and strength, a dolphin's spear-like snout can even pierce a shark's body and inflict fatal damage on it.

Moreover, there is another existence in the dolphin family that can be called "king" in the shark world - killer whales.

Killer whales are to the shark world, just like Chinese table tennis is to the international table tennis world, which is beyond hell and even purgatory-level difficulty, and the existence of the tip of the pyramid.

What basking sharks, weasel sharks, porphon sharks, sixgill sharks, when they encounter killer whales, they are all scared.

Although the cattlefish does not have cartilage and connective tissue all over the body, it has the same soft abdomen and sharp spears, and the dolphin with ultra-high swimming speed is not scared at all.

In Bi Fang's perceptual circle, when the Niugang trevally reappeared, its speed had dropped by the most, and it was floating quietly in the water.

Bi Fang gripped the harpoon and slowly approached, the closer he got, the clearer his perception became, and he could detect the pitted holes in the body of the ox harbor trevally, as if it had been repeatedly pierced by a spear.

It seemed to sense Bi Fang's approach, and the trevally wanted to escape, but a spear slammed through the eye of the trevally, hitting the brain, and the already seriously injured trevally was killed on the spot.

Dealing with the trevally, the dolphin appeared very happy, constantly swimming in Bi Fang's perceptual circle.

It's a bottlenose dolphin.

Previously, the trevally and the dolphin competed, and the speed was too fast, and Bi Fang didn't have time to feel it carefully, but now he finally saw what kind of dolphin it was.

It is the most common bottlenose dolphin in the aquarium, also called the sharp-billed dolphin and the bottlenose dolphin, which are mainly distributed in the temperate and tropical oceans, including the Yellow Sea, the Bohai Sea and other seas in China.

The snout is long, the mouth is short, and the mouth is always smiling, and it is a second-class protected animal in China.

Female bottlenose dolphins have a lifespan of around 80 years, while male bottlenose dolphins are not easy to live for 50 years due to their more stressful lives.

This species of dolphin has a very high intelligence, is self-aware, has strong feelings, and even has scheming.

It has been argued that dolphins should rank ahead of chimpanzees in intelligence, second only to humans.

The bottlenose dolphin in front of me is quite large, more than two meters three, and weighs absolutely more than three hundred kilograms, such a large body size, it should be a male.

Two meters three, three hundred kilograms, compared to only one meter sixty or seventy kilograms, the cow harbor trevally is nothing at all, it is just a small fish and shrimp.

No wonder it was so easily resolved.

Watching the dolphins swimming beside him, Bi Fang couldn't help but reach out and touch it.

As a professional diver, it should be a basic rule not to touch the creatures in your hands at will, perhaps a little human dander will cause damage to the seabed ecological environment.

Bi Fang's fingers touched the swimming dolphin, this bottlenose dolphin seemed very calm, Bi Fang pressed hard, through the wetsuit can be felt, the dolphin's skin is smooth like silk, the texture is like a sponge, the beauty is extraordinary, and the texture is excellent.

After waiting silently for a while, another streamlined creature broke into Bi Fang's perception circle.

Another bottlenose dolphin, which also swam beside Bi Fang.

Male bottlenose dolphins usually live alone or in small groups of 2~3 individuals, and they will only join the larger groups of other female bottlenose dolphins for a short period of time.

It is worth mentioning that the members of the bottlenose dolphin group have a strong attachment to each other, and if one individual is injured, the other members do not run away, but gather around the injured companion and cannot bear to give it up, and it is an extremely compassionate species, and this is true for every single one.

In this respect, dolphins are much more intelligent than humans.

On this planet, dolphins are second only to humans in terms of intelligence.

Its brain weighs almost as much as a human, at about 1.5 kilograms.

Humans have the highest brain share of any animal on Earth, at about 2%, while dolphins come in second at about 1.5%.

In addition, dolphin brains have 18 billion neuronal cells, more than the 13 billion in humans.

Therefore, dolphins are far stronger than other animals in terms of comprehensive brain data indicators, and they are second only to humans.

Dolphins can use ultrasound to sense the skeletal structure of a human body and determine whether the other person is human.

They often rescue drowning humans, lifting drowning people to the surface of the water to breathe, and just like rescuing their own companions, they will also fight sharks to save humans.

Various experiments were conducted to study dolphins, including one secret experiment that was not revealed until more than 50 years later.

In 1963, NASA-funded an experiment was conducted in the U.S. Virgin Islands on a male bottlenose dolphin named Peter to study whether dolphins could learn human language and successfully communicate with humans.

The team set up a room filled with water, and a female researcher named Margaret lived with Peter, 24 hours a day, eating, sleeping, studying, and having fun together.

This allows Margaret to teach Peter to speak English like a mother teaches her child, and to make him understand and understand human language.

Dolphins do not have vocal cords, but they can use the stomata on the top of their heads to make sounds.

Peter the Dolphin showed an amazing ability to learn, and in less than two weeks, he learned to say the numbers "one, two, three", as well as simple greetings like "hi, hello", and eventually learned more than 700 English words.

Amazingly, Peter doesn't simply "parrot the words", because when Margaret says "work, work, work", which means to learn, he really understands and answers "play, play, play", telling Margaret that he doesn't want to learn, he wants to play.

Even when Peter wants to eat fish, he says "fish in bucket" to Margaret, meaning it wants to eat the fish in the bucket.

However, as the experiment progressed, something unexpected happened.

Peter is increasingly reluctant to learn, and only wants to be close to Margaret, and he tries to attract Margaret's attention in various ways every day.

When Margaret leaves it because she went to the toilet, Peter becomes irritable.

When Margaret is on the phone, Peter will yell at the phone.

Obviously, it's jealous.

Peter had fallen in love with Margaret, which led the research team to believe that the experiment was going in a direction beyond their control, so the experiment was terminated, and they forcibly separated Peter and Margaret, who was reluctant to leave Peter, but there was nothing she could do about it.

When Peter found out that Margaret was no longer there, he became extremely angry, and he kept swimming around the pool, constantly calling Margaret's name, not eating or drinking.

One day, a few weeks later, Peter suffocated himself when he lurked under the pool and refused to come to the surface to breathe.

Dolphins breathe in a completely different way from other animals, and it is absolutely impossible for humans to commit suicide by holding their breath, because after suffocating and falling unconscious, the body instinctively lets go of breathing.

But dolphins need brains, not autonomic control, to breathe, so each breath requires active muscle manipulation.

This was a scientific view in the past, and it was widely used to explain the reason why dolphins committed suicide by holding their breath.

But Richard told Bifang that this was inaccurate.

Someone has used complex and complete anesthesia experiments to prove that dolphin breathing can be both "automatic" and actively controlled.

They can kill themselves by suffocating by closing their stomata.

So everything proven.

This dolphin was martyred.

What is suicide?

This is a complex issue, and modern science still does not fully understand why humans commit suicide, and the risk factors for human suicide are still undetermined.

The Ugly National Psychiatric Association lists suicidal behavior as a "disorder for further consideration."

Even the determinants of human suicide are controversial – a matter of biology and psychology as much as philosophy and semantics.

It has also been pointed out that even in humans, pre-pubescent children, or children with developmental disabilities, there is very little suicidal behavior.

None of the human children can understand the concept of suicide, nor is it possible for the most intelligent non-human animals to be more intelligent than human teenagers, and it seems even less likely that they will understand their own death and have the ability to perform suicidal acts.

In Bi Fang's view, the so-called suicide requires that the actor must be self-aware, understand the true meaning of death, and have the ability to perform a series of actions that he knows will lead to his own death.

Everything proves that dolphins are extremely self-conscious.

Due to the ethical issues involved in this experiment, the materials and archives were sealed at the time and have not been made public.

It wasn't until 2014 that the experiment was finally declassified.

Bi Fang slowly spit out a bubble, he looked at the dolphin next to him, slowly clenched his fists, and the muscles of his whole body were mobilized.

He punched the dolphin in the head.

You helped me, but I'm sorry I'm going to hurt you.

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