মাছি খাবারের ওপর বসলে কি করে?

 After what you read, you will probably never touch that food on which a fly landed...

Most of the more than 110,000 known fly species have no teeth, so they cannot chew solid food. Their mouthparts are like a spongy straw. Once they land on the food, they need to release digestive juices to liquefy it into a pre-digested, gobbled soup that they can swallow.

To fit more food into the stomach, some flies try to reduce the liquid of what they have already eaten. They regurgitate food in vomit bubbles to dry it out a bit. Once some of the water has evaporated, they can ingest this more concentrated food.

And they do this operation just when they land on your macaroni with meat sauce or pork chop.

Disgust aside, what should worry you most when a fly lands on your food is not its vomit, but rather the microbes it could release upon contact with its legs.

In fact, flies land on everything, excrement, corpses and rubbish in general, thus becoming vehicles of even serious diseases.

But flies also have a reason to exist. Meanwhile they are food for other animals. They are an important group of pollinators, and many plants require flies to reproduce.

Some flies also have medical uses. For example, doctors use midge maggots, the young, immature form of midges, to remove decaying tissue in wounds. The worms release antiviral and antimicrobial juices, and these have helped scientists create new treatments for infections.

Finally, biomedical scientists around the world study fruit flies to find causes and cures for diseases and genetic disorders.

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