Why do flies always rub their hands?

The fly is a typical completely abnormal insect, although it does not have a nose, it has other taste organs, and it is not on the head, face, but on the feet. As long as it flies to the food, first use the taste organs on the feet to taste the taste of the food, and then use the mouth to eat, let's take a look at why flies always rub their hands!

Flies are not infected by bacteria.

Flies eat unfavorable bacteria at the same time, so the method of "spitting while eating" helps to eliminate bacteria quickly. It takes only 7-11 seconds from eating, absorbing nutrients to excreting waste out of the body. When it comes into contact with bacteria that have the ability of rapid reproduction, the immune system of flies will emit BF64 and BD2 globulins. Once they come into contact with bacteria, they will "explode" and "die together" with the bacteria. The emission of these two globulins is always one after another, in pairs, never confused.

Why do flies always rub their hands?

1. Keep hands and feet clean: flies move everywhere and have a lot of dirty substances on their bodies. If these substances are not removed, they will increase the weight of flies and affect their flight. After touching things, the suckers on their hands and feet are attached to the surface of the object when they land, and it is not easy to walk quickly when they stop, so why do flies keep rubbing their hands and feet?

2. Keep the sense of taste sensitive: flies have taste receptors on their feet, that is to say, if we humans want to taste, we need to put food in our mouths, but flies can taste it by touching it with their feet. So when the fly stops, it will constantly touch it with its feet, taste it, and rub it again, in order to clean up the taste receptors, remove the old taste, and then touch it again to taste a new one. No wonder the fly we saw was always walking around rubbing its feet when it stopped. It was unexpectedly that it was tasting everywhere.

3. Spread symbiotic bacteria: whenever the fly flies over the dirt, it will land on it, crawl on it, rub against it with its feet, and attach the bacteria to its own feet. When the fly completes this task, it will take off again, and then it will land on human food, start rubbing the feet, and rub the bacteria off the feet, and the bacteria will fall on the food, and the spread of bacteria will be completed. When people eat these foods, bacteria will enter the human body, and parasitic in the human body, and bacteria belong to symbiotic relationship.

The living habits of flies

1. Mating: flies have the physiological characteristics that once mating can lay eggs for life. at a suitable temperature, males and females can sexually mature and mate in 18-24 hours and 30 hours after Eclosion, and the mating time is usually in the early morning.

2. Spawning: the pre-spawning period (that is, the time from Eclosion to the first spawning) of female flies is closely related to the environmental temperature, and the fecundity is amazing. According to the most conservative estimate, each female fly can produce 200 offspring. The total number of flies that need only 10 generations of reproduction will reach 20 trillion.

3. Feeding habits: the feeding habits of flies depend on their species, some specialize in sucking nectar and plant juices, some are addicted to human, animal blood or animal wound blood and eye and nasal secretions, while the common houseflies, big-headed Chrysophora, Mercerized green flies, Calliphoria, sesame flies belong to omnivorous flies, that is, they widely consume human food, livestock and poultry secretions and feces, kitchen scraps and organic matter in garbage, etc. It has a strong tendency towards sugar, vinegar, ammonia and fishy taste.

4. Development: flies are biologically typical completely abnormal insects, which need to go through four stages: egg stage, larva stage, pupa stage and adult stage.

5. Lifespan: the influencing factors of fly lifespan are temperature, humidity, food and water. The best temperature is 25-33 ℃ and air humidity is 60-70%. The adult lifespan of ordinary flies is 15-25 days. If larval and pupa stages are included, the lifespan of females is 25-70 days. Females live longer than males, and their lifespan is 30-60 days. Under low-temperature overwintering conditions, flies can live as long as half a year.