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Many people know that flies often land on dirty surfaces and can transmit various diseases. For this reason, they wonder what action to take when one lands on their food and seems to vomit.

When a fly appears to vomit, it often means that it is trying to air out its digested food. Over 110,000 of the known fly species do not have teeth for chewing. Instead, their mouth resembles a spongy straw.

Why does the fly vomit on food?

When a fly lands on food, it secretes digestive juices that give it a soup-like texture making it easier to swallow. Furthermore, some flies vomit to reduce the liquid in the stomach as this would allow them to eat more food.

Another exciting thing about flies is that they cannot taste food with their mouth. Flies have receptors on their feet that allow them to know if they are standing on something nutritious. Sometimes the insect might groom itself by cleaning the sensors on its legs to understand better the nutrients in the food it lands on.

Flies can be dangerous as they tend to land on dirty surfaces before landing on your food. For this reason, they can carry a lot of microbes, thus making you sick hence why we cover our food.

How flies can be useful

Although flies can transmit diseases, they are not always bad. Instead, flies play a part in pollination, thus helping plants to reproduce. Scientists have found that the blowfly can carry more pollen grains than the honey bee, making the former a better pollinator. They are also a crucial part of the ecosystem as frogs, lizards, birds, spiders, and other animals eat them.

Flies also have medical uses. Doctors used fly maggots, immature flies, to get rid of decaying tissue on wounds. While this practice is not as common today, some scientists have used maggots to create treatments for infection using the anti-microbial and antiviral juices they produce.

Additionally, flies have also been helpful in medical research. Researchers have used another fly species, fruit fly, for medical studies that look into potential treatments and causes of diseases.