| scientific wormhole
A video circulated widely on the Internet, the protagonist is a fly, but the content is a little scary: the fly that is rubbing his hands, rubbing and rubbing, actually rubbed his head off, making people look dumbfounded on the spot.
Many netizens suspect that the photographer directed himself and acted by himself, artificially removing the head of the fly to make a grandstand, but in fact, the fly may really screw its own head off. So why do flies do this, and how long can they live without their heads?
Flies are one of the most hated insects in humans, especially in the summer, and if they are not noticed, the buzz of flies will be around them, and food will be contaminated by them.
The diet of flies is very complex, with different types and different food preferences. Some like to suck nectar and plant juices; some specialize in eating human and animal blood and eye and nose secretions.
The common houseflies in our lives are omnivorous, eating both human food and animal secretions, excrement, and organic matter in garbage, etc., like sugar, vinegar, fishy smell and so on.
The way flies walk is very special, we all know that "triangles are the most stable structures", and they seem to know this well.
The fly has a total of 6 feet, when walking, the front and back feet on one side will form a "triangle" with the middle foot on the other side, forming a total of 2 sets of "triangles".
In this way, when one of the "triangles" steps forward, the remaining group can maintain the balance of the body.
The lifespan of flies is very short, only about a month from birth to death. However, they can lay a large number of eggs in a limited time, and their reproductive ability is very terrible.
Unlike other animals that mate and produce once, flies can lay eggs for life at a single mating, which can be described as once and for all, which is also an important reason for their strong reproductive ability.
It is understood that a female fly in the laboratory can lay 600-1000 eggs in a lifetime; in nature, a female fly also produces 400-600 eggs.
Typically, houseflies reproduce 10-12 generations a year. According to conservative estimates, if there are 100 mated female flies, each laying 200 eggs, only 10 generations, the total number of newborn flies born can reach at least 2 trillion.
This shows how terrible the fecundity of flies is. Their lifetime is very short, so the growth process is also accelerated, from egg development to adults only take 7-14 days.
For this pest that is very close to our lives, many people have more or less observed, and it is not difficult to find. Flies like to "rub hands", and even "fly rubbing hands" has become a popular word on the Internet.
So, why do flies rub their hands? The reason why humans rub their hands is usually because they feel the cold and want to warm their hands by rubbing the heat.
Flies rub their hands not for this reason. They rub not only their hands, but also their whole bodies, including their heads, which is related to their body structure.
Flies have dense fuzz on their feet that can help them stay on objects such as food, but there are also certain "side effects": food scraps, dust and other things will stick to it.
Keep in mind that the average weight of flies is only a few tens of milligrams, and these substances on the foot hair stick will obviously increase their weight. In this way, their flight will be affected.
Therefore, the fly "rubbing hands" is actually self-cleaning. In addition to reducing the burden of flight, this method can also maintain the sensitivity of the sense of taste.
The taste organs of flies do not grow on the head like we do, but on the feet. They rely on taste receptors on their feet to find food, taste it, and then eat it.
In addition to this, scientists have also found other intentions of the flies to rub their hands. During the courtship phase, they rub their hands more frequently, most likely releasing courtship information. In summary, flies often "rub hands", which is conducive to their life and reproduction.
Just rub your hands, why do you still screw your head off? It's not fun, except for a very small number of creatures that have their resurrection skills lit up, the vast majority of creatures will die quickly after losing their heads.
Scientists have discovered a type of sea slug in which the head is still able to move after the head is disconnected from the body, and the neck wound heals in one day; after a week, the head grows a heart; after 20 days, it basically grows a new body.
However, most creatures, including flies, do not have such magical abilities. So why do flies seek their own death?
In fact, in flies, rubbing their heads is the same as rubbing their hands and feet, as long as they are stained with food residue and dust, they will reflexively "rub" and clean it up.
Their behavior is not controlled by the brain like humans, and they cannot judge the danger of "rubbing their heads", and sometimes they rub their heads off.
After the head was taken off, the movement of the fly rubbing hands did not stop immediately. This shows that "screwing the head off" is an accident caused by rubbing hands, and it also means that they do not die immediately after the severed head.
So, how long can a headless fly live? The answer is simple, see how long they can carry hunger. The head, mouth, and body of the fly are controlled by different central nervous systems.
After the severed head, the fly body can also perform movement and sensory functions. In addition, flies are arthropods and the blood circulation is open-tube circulation, so severed heads do not cause major bleeding.
Under such an auspices, flies without heads still retain the ability to move, of course, they cannot survive. Because of the loss of their heads, the flies cannot eat, so the end result is often starvation.
Finally, we remind everyone that the ingredients where the flies have stayed are best cleaned, and the food they have stayed in should not be eaten. Because you don't know what they ate at the last meal, it could be human food, it could be feces, garbage.
Moreover, they are also creatures that can be eaten and pulled. Life habits lead to flies are likely to carry and infectious bacteria, in order to prevent disease, or pay attention to fly prevention.
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