Why do house flies fixate on you for long periods of time when plenty of food is nearby?
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Something that has yet to be mentioned is that flies can get food with relative ease. But water in a house can be hard to come by. If a house fly is stuck indoors and the sink isn’t full of droplets, your face, eyes, mouth and nose are prime sources of moisture, and they need that to survive. I once spoke to some guys who worked in a mine in NZ and they said they needed to wear mesh head coverings because 1000s of flies that lived in the pits they dug would drink the moisture off their face in minutes if they weren’t wearing them. Creatures don’t just need food. In the heat, they need water too.
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