Human beings are a very lethal animal, as early as tens of thousands of years ago, when human science and technology were far less developed than today, they had already blocked the killing of Gods and Buddhas.
Scientists have found that after humans landed in the Americas 12,000 years ago, 50 genera were extinct in 60 genera in South America and 34 genera in 47 genera in North America.
After humans arrived in Australia 50,000 years ago, there were 24 species of creatures over 50 kilograms, but 23 of them became extinct, leaving only kangaroos.
In addition, where humans reach, where the wildlife will become extinct, or the number will decrease. Therefore, anyone who learns to avoid human wildlife will have a chance to survive; any wild creature that does not learn to avoid humans will be eaten to extinction by humans, and this is how Tesla's great sea cow became extinct.
But there is one exception to this animal, which seems to like humans very much, not only is not afraid of humans, but also takes the initiative to rescue humans in difficulty, it is a dolphin. So what's going on here?
Dolphins and whales are more closely related, and studies have found that they evolved from terrestrial mammals, and their ancestors are closer to those of the order Even-hoofed, wolf-like creatures that entered the water 50 million years ago and gradually adapted to the marine environment.
Some people think that dolphins and humans have a good relationship because they have a gentle temperament and are gentle with any animal. But the study found that it is not so simple, and some dolphins are also quite ferocious, and even kill animals. Scientists at marine mammals at the University of St Andrews in the United Kingdom say their study found that bottlenose dolphins engage in violence, and they often manage to kill smaller harbor porpoises but don't eat them.
In addition, the researchers also found that male dolphins compete for supremacy, and this process often involves bloody conflicts. That is, dolphins do not rescue humans because of their gentle personality.
Some people have suggested that dolphins rescue humans because they treat humans as companions. Dolphins are able to survive in the ocean, but they go to the surface of the sea to breathe every once in a while, while their pups need to breathe on the surface of the sea every 2 minutes or so.
In the event of an accident, adult dolphins also gently lift their pups with their kisses and bring them to the surface. In addition, they use the same method to care for injured or sick companions. Therefore, it is believed that dolphins regard people who fall into the water as part of the family and use this method to rescue the victims.
Of course, it has also been observed that they will not only rescue their companions and humans, but also rescue various inanimate "victims", a phenomenon that is not well explained.
In addition to rescuing those in distress, studies have also found that dolphins also help humans fend off sharks. This habit is also common in their populations, and although adult individuals are not afraid of sharks, dolphin cubs are not self-protective, so when dolphins encounter sharks, they will put the cubs in the center and adult individuals will drive away sharks.
In this regard, some scientists believe that we can not completely treat dolphins as animals, research has found that their brains are very developed, and their social awareness is also very strong, so dolphins may understand our fears, and even sympathize with us, and then help us.
So does this statement make some sense? In fact, regarding the IQ of dolphins, many scientists today believe that their IQ may not be high, because their brains only occupy 0.9% of the body, which is the same as the brain volume of elephants, while the human brain volume accounts for 2% of the human body.
In addition, marine mammals generally have large brain volumes because they maintain heat in icy waters. In the eyes of these scientists, the IQ of dolphins is not very high, but some scientists believe that the IQ of dolphins can be equivalent to that of human 6-year-old children.
However, regardless of whether they have a high IQ or not, it is certain that they are obviously friendly to humans, but humans are not so kind to them.
The most direct harm humans do to dolphins is fishing for dolphins, which in many countries used to feed on. "Dolphin Bay," which won the Academy Award for Best Documentary Feature, tells the story of the Japanese hunting dolphins.
In addition, human overfishing of marine life has also caused a large number of dolphins to die due to lack of food, and the existing dolphin population has been declining.
In addition, dolphins are still present in aquariums around the world, and even dolphins participate in the performance. These performances are extremely harmful to dolphins, and the artificial environment will also reduce their lifespan, and when they die, new dolphins will be transported here to participate in animal performances.
Because of this, there are many environmental organizations and individuals who are calling for the improvement of the dolphin environment, and we hope that we can also participate in it.