The dog is a loyal partner of mankind, and mankind has tamed this animal very early. In ancient times, dogs were used to visit or hunt, but in modern times, keeping dogs has become a personal hobby. Many people will keep dogs as pets, because dogs are human and can make reasonable responses in specific situations.
Why does a dog bark at the air more than
People who have owned a dog may have encountered such a situation. When there is no one outside the door, the dog suddenly barks at the air and changes direction. Sometimes I kept backing and whimpering, as if I saw something "dirty".
There are some superstitions in folk rumors, and black dog blood is related to dogs, which can be used to drive away evil spirits. Whether black dog blood has the function of exorcising evil cannot be confirmed, but the ability of dogs to surpass humans has indeed been confirmed by research.
The ability of a dog is reflected in the sense of sight, hearing and smell. It is common sense that a dog's nose is very sensitive, which is why the dog is capable of such work as anti-narcotics and minesweeping. However, the sensitivity of a dog's nose may exceed the cognition of ordinary people. The human sense of smell can distinguish thousands of odors, and the dog nose can smell 2 million, which is 10 million times more sensitive than the human nose.
The developed sense of smell of a dog is related to the special structure of the nose. Its olfactory epithelium covers an area of 170 square centimeters. The inside of the nose has a complex structure in which gas molecules can be fully recognized. This is also a lot of canines. Important features. In the process of natural evolution, canines have evolved a developed olfactory system and can find a variety of foods in the wild.
The dog’s ability in many aspects is higher than that of human
The dog’s vision is also very developed, but this is not reflected in the color resolution, but can recognize weaker light. Especially at night, when a dog can see far away things clearly, it is dark when people see it.
This is related to the structure of the dog’s eye. There is a reflective film at the fundus of the dog’s eye.The light passes through the retina to reach the fundus of the eye and is re-reflected back so that a weaker light can be captured. There are more rod cells in the dog's eyes, and this type of visual cell is mainly used to distinguish the dimness of light. However, there are fewer cone cells in the eyes of dogs, which are used to distinguish colors.
The dog's ability to distinguish colors is very weak, and the objects it sees are mostly gray and yellow-green. In addition to the unique characteristics of smell and vision, the dog's hearing is also its advantage. The structure of dog ears can collect faint sounds, and the hearing range is wider than that of humans.
Humans can generally hear the sound in the range of 20Hz~20000Hz, and the sound beyond this range is not perceivable. The dog can hear the sound of 15~50,000Hz, it can hear the infrasound wave in a certain frequency range, and it can also hear the ultrasonic wave .
The hearing of dogs is the most advanced among animals. Cats can hear 60000Hz ultrasonic waves. The upper limit of the hearing frequency of bats is up to 240,000 Hz. It can be seen that the hearing ability of animals is indeed much higher than that of humans.
Dog barking is more than just perceiving movement that humans have not perceived.
It is precisely because of these abilities that dogs can see or hear something that humans cannot perceive, and it is excusable. If the dog barks at a certain place in the house, there may be some reason for the sound wave.
A dog can hear ultrasound, but it has a certain tolerance limit to ultrasound. If it exceeds this limit or reaches a certain threshold, the dog will show resistance and fleeing behavior.
There are many scenes that generate infrasound in daily life, and ultrasonic generation sources are not so common. When a certain part of the building vibrates, low-frequency sound waves may be generated.
For such reasons, humans naturally do not need to worry too much, unless it is the infrasound generated by earthquakes. So the dog barking is not just because there is something invisible "dirty",But there are some changes, it may be a little movement in some places, such as rats and the like.
Perhaps the dog may hear other dogs barking, and will continue to bark. As a result, all the dogs in an area will bark. This situation is more common. Pet dogs generally do not have that high level of vigilance, and it is rare that they bark more than ever.
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