On October 15, a 6-meter-long marine monster was photographed in Hawaiian waters. This shark, named "deep blue" by shark expert Mauricio hoyos padilla, is not the first time it has been photographed, and experts in the field are familiar with it. When the discovery channel's "Shark Week Feature" made a documentary, it asked shark experts to swim with it.
It is reported that it is more than 50 years old, and in the chaotic earth taken over by humans, it can escape the influence of marine pollution and human hunting, and live to this age healthily, which is really a bit incredible. In particular, its area of activity is not an off-the-beaten-track area.
The female shark has a docile personality, and the diver even goes to hold its fins, and it is not at all annoyed.
Isn't it true that sharks are very grumpy and attack humans? What is going on with this harmonious scene?
That's right, today we're going to talk about an old topic: our misconceptions about sharks.
Sharks are indeed dangerous wild animals, and shark attacks that cause human deaths are also occasional, but this does not mean that sharks just like to attack humans.
In fact, sharks hurt less than 5 humans a year, and humans can hunt sharks up to the million level. There are nearly 500 species of sharks on Earth, and only 12 of them can pose a danger to humans.
Some people will say: Isn't it that 5 people are attacked by sharks every year?
A recent team of Australian scientists published a research paper in the Royal Society Interface Journal in Australia, showing that great white sharks have extremely poor vision, limited ability to recognize colors, and far lower visual acuity than humans, so it is impossible to distinguish organisms on the surface of the water from underwater. Especially after the misleading of ripples and light through the surface of the water, the posture of the same mammals on the surface of the water is very similar to that of the seal sea lion.
While the study specifically refers to great white sharks, the part of the world that is supposed to pose a possible threat to humans has poor vision, and the team is exploring whether the conclusions about great white shark vision apply to other sharks.
Compared to dying from shark attacks, our chances of dying from lightning strikes are even higher. Therefore, sharks do not specifically attack humans. Of course, this does not mean that sharks are not dangerous.
Sharks do get oxygen by letting water flow through the gills, after all, they don't have lungs like humans. But not all sharks can only swim non-stop, and different species of sharks have different breathing techniques.
For example, the Caribbean reef shark, this species will look for a place where the water flow is strong, and then they will stay in that area to rest, let the water "self-help" flow through their gills, so that they can breathe without moving. This method is called "stamping ventilation". The nurse shark, on the other hand, will keep a certain amount of water in its cheeks and slowly pour it into its gills. Although you can't rest for a long time, you can at least take a short break once in a while.
However, great white sharks do need constant activity to breathe.
I don't know when it started, but there are always people who say that sharks don't get cancer, and because of this inexplicable rumor, people in many areas have caught sharks in large numbers and used all parts of their bodies to make various foods and medicines.
It is true that sharks are not as prone to cancer as humans, but it is not that there is a compound in shark cartilage that inhibits angiopoietin. But this is an ability that humans cannot obtain by eating it. Researchers in Australia have found great white sharks with large tumors on their mouths, and after further testing, they found that it is cancerous.
Misunderstandings are common in human life, but when people act on these false beliefs, everything gets really bad.
Many people and animals are plagued by misunderstandings, the so-called "do not do to others what you do not want", I hope that in the future, I will not casually make up my mind about other things. Don't listen to the rumors of seven, seven, eight, and eight, and take the authoritative information as the standard.
I also take a look at this article, and refer to it as a reference.