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Because the main part of the fly is not the head, but in the chest.
The way flies overwinter is quite complex. It can overwinter in a pupal state, as well as in the form of maggots and adults. In the cold zone and temperate zone of the north, there are no active house flies in nature, but there are still adult flies in the indoor heating room, and the greenhouse of vegetable greenhouses often becomes the birthplace of a large number of flies in the warm spring of the following year.
Lay eggs. Flies hatch white, tiny larvae about 1 day after laying eggs. The larvae of flies are also called maggots, and the food of fly maggots includes livestock feces, garbage, and some decaying matter.
Maggots are very active, from the moment they hatch, they are constantly stirring around, constantly burrowing around, and they are also strong light-proof and social.
Maggots prefer to lurk a few centimeters below the surface of their food to feed. After the maggot matures, it crawls to the surrounding drier environment such as loose soil, sawdust, etc. to pupate, and if the surface of the food is dry, it can also pupate on the surface of the food.
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Flies are strange and artifact creatures that screw their heads off.
When the fly combs the debris on its leg with its front legs, it unconsciously twists its head off, which is an unconscious behavior, so to some extent, the fly's biggest enemy is itself, because it is likely to accidentally screw its head off. The fly unconsciously unscrews its head, so after the fly unscrews its head, it can still survive for a period of time, which is related to its body structure.
Generally speaking, like humans or most animals, the head is a very important organ, and if you lose your head, then you will die instantly, right? But for flies, this is not the case. What does it mean that the circulatory system of flies belongs to the "on-off cycle"?
That is to say, unlike humans, its blood does not circulate all its blood in the heart or blood vessels, its blood is in the body, so even if it has a broken head, it will not lose a lot of blood. Because the circulatory system, respiratory system, and nervous system of the fly are not highly concentrated in the head, unlike mammals, so when it loses its head, it will not die after the following sub-species, from this point of view, the distribution of these important organs of the fly is very even, which can ensure that when it encounters an enemy attack, even if a part of the body is attacked, even if the injury will not be fatal. Because these important organs in the body are evenly dispersed, unlike humans, most of the important organs are concentrated in the head, so this is also the reason why flies can survive after unscrewing their heads.
The fly with its head unscrewed does not mean that it will not die, but only that it will not die immediately, and when the food on its tail is digested, there will be no more food, so it will naturally be hungry.
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Flies rub their heads off is an unconscious act, and flies often "rub their hands" for several reasons: recognizing the smell of objects, summoning a mate, and rubbing food scraps off their legs to reduce the weight of the flight.
Can a fly still survive if it is rubbed off?
The head of the fly can survive for a period of time after rubbing it off, because the circulatory system, respiratory system, and nervous system of the fly are not highly concentrated in the head.
Flies will starve to death if they lose their heads, and although they will not affect blood circulation without a head, they will not be able to continue eating.
Although flies have a strong tolerance to bacteria, they are only maintained by rapid excretion when the body is intact, and they will die from bacterial infection after losing their heads.
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I can't press it。If the fly's head falls off, the nerves connecting the head to the body part are broken, so the head cannot be removed and put back on, so the nerves cannot be connected. We can find that many flies die with their heads and bodies separated, which is why they die.
Because flies do not have the same regenerative ability as earthworms, and the body structure of flies is more complex.
Types and hazards of fliesThe biological classification of flies belongs to the class Insecta, Diptera, and Cycloschizoides, and there are many species of flies, including residential flies and non-residential flies, and there are not many residential flies related to hygiene. There are several common ones, such as houseflies, city flies, big-headed golden flies, green flies, and hemp flies. In addition to invading homes and working environments and stinging and sucking blood, the harm of flies to people is mainly to transmit a variety of infectious diseases, such as dysentery, typhoid, cholera, poliomyelitis, trachoma, tuberculosis, hepatitis B and other pathogens.
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Flies are arthropods, insects, and ptera, and belong to typical insect organisms. Although the lifespan is only one month, the short lifespan does not at all prevent them from "conquering" flies all over the world.
If you pay attention, you will find that the fly stops to rest, will continue to rub the foot, and the two forelimbs rub rapidly, leisurely, as if the two forelimbs are cold and need to constantly rub the heat, which almost every fly does. Flies rub their feet, sometimes play with their heads, as if their heads are used as toys, thrown away directly, and the most outrageous thing is that flies lose their heads and can also survive for a while, and many activities are almost unaffected, except that they cannot distinguish directions, they can also fly. The scene looks incredible, and theoretically, after a creature has no head, it rarely survives, and not flies being the exception.
Why do flies turn their heads to play? Don't you really care?
The reason why flies unscrew their heads is closely related to their penchant for rubbing their feet. Flies rub not only their feet, but also their faces with their front legs. In fact, this habit is the same as instinct.
For example, cats often wash their faces with their paws, and cats wash them carefully. First of all, the practice of flies is naturally clean and hygienic. Its leg structure tends to adhere to food scraps, feces, and other garbage, and the remaining residue can increase the weight and flight resistance of flies.
If we don't deal with them, we will consume a lot of stamina on the next flight.
Although flies are annoying, they don't deliberately screw their heads to play. It's a completely unconscious actThe flies end up paying for their actions. The flies themselves are not very intelligent and do not realize what they are doing at all.
Flies will fly around after they have no head. There are no rules. We also use the term headless flies to describe the chaos of work.
In fact, the position in which the flies themselves walk is not allowable. While the fly's respiratory system is not affected, it loses its oral equipment, which means it has no ability to eat and will eventually lose its life due to starvation. This result is entirely self-inflicted.
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The fly is a very inferior animal, and in the process of rubbing its hands, it will accidentally rub its head off, but the fly itself does not know that it is an accident.
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It's just that because they are very close, they take off their heads and play by themselves, sometimes they don't know that they are very inferior animals.
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I have never seen this phenomenon myself; But I've seen a fly wash his face, and I think it's probably because he was trying too hard to wash his face, so he accidentally pulled his head off.
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Their unconscious movements may be the result of a fly accidentally tearing its head off while rubbing its hands and face.
On each claw of the fly, there is a hook claw and claw pad, the hook can grasp the object and use it to support the body, and the gland on the paw pad can secrete lipid fluid to increase adhesion, which is why the fly can hang upside down on the smooth glass and not fall down.
For the vast majority of animals, the head cannot survive after it falls off, but flies are insects, and the circulatory system in their bodies belongs to the open-tube circulatory system, and the blood mainly flows between the heart, dorsal blood vessels, and various organs and tissues, and flies can breathe with their abdomen, so when the head is unscrewed off, the fly just can't see things, and can still move.
Due to the lack of heads, flies cannot eat normally and can only excrete, and the energy is constantly lost, and the possibility of starvation is high in the end, and death may also be caused by bacterial infection in the wound.
Since they don't have a nose, flies rely on their legs' taste and tactile senses to distinguish the taste of food, and if their legs are covered with dirt, it will affect their judgment of food. In order to be able to distinguish smells correctly, it is necessary to rub your hands and feet frequently to ensure the precise sensitivity of the taste organs. On each claw of the fly, there is a hook claw and claw pad, the hook can grasp the object and use it to support the body, and the gland on the paw pad can secrete lipid fluid to increase adhesion, which is why the fly can hang upside down on the smooth glass and not fall down.
Flies also like to fly around, see something, will pounce on it to taste, legs are easy to stain all kinds of food, leisure time to stop to rub hands and feet, clean up the food on it, is conducive to their rapid take-off and barrier-free landing.
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