When a fly lands on your food, it first uses sensory organs on its feet to “smell” the food. Flies do not have teeth to bite a chuck out of food.
Flies REGURGITATE (vomit liquid from its stomach) on food that is hard. Much like the spit in your mouth and the liquid in your stomach, a fly’s vomit has chemicals that will digest food. (Digest means to break the chemicals into smaller parts.)
Some of the digested food dissolves in the fly’s vomit. Now the fly has to suck its vomit and the dissolved food back into its body.
They don’t eat very much of your food. In fact you don’t even notice the extremely tiny bit that a fly might remove. If you quickly swish the fly away it might not eat anything.
They are attracted to manure and rotting food. This means they may have some of this stuff on their hairy legs and in their stomach.
There are more than 16,000 species of flies. But they all belong to the order Diptera, meaning two wings. Because they only have two wings, flies land often and therefore can deposit thousands of bacteria each time they land.
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