Flies have olfactory hairs covering their bodies. They can smell better than we can. So once you open food packaging, you create a plume of molecules that you can’t sense for being too dilute, but the flies can. And the further that plume expands outward, the more flies in the area can smell it and go looking for it. There may not be any flies in sight, but that merely means you can’t see them, that doesn’t mean they aren’t there.
They have a sense of “smell” that compels them towards certain chemicals in the air that come from food and liquids with nutritional value. It’s particularly intelligent, either — they’re compelled towards them. It’s more like water flowing through the path of least resistance. This is the life of a fly, they’re compelled to follow smells for their entire existence, only taking a break for a moment when they sense danger.
They then forget the danger, almost immediately, being perpetually compelled back to the source of the smell.
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