We’ve all been there. Walking along and suddenly loads of tiny midges or flies, and after 2 or 3 steps they are all gone… Left behind in the same place. They don’t seem to be going anywhere or doing anything.
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If there’s something in that spot that draws one, it’ll draw any others in the area depending on the senses of the insect and the strength of the thing drawing them.
If it’s a warmer patch of air, they follow the gradient; heading in the direction where the air is warmer until they’re in a patch where there is no air warner than there (near them). Or replace warmth with light. Or pheromones. Or a smell that means food. A bunch of insects in an area following the same stimuli will naturally converge in the same area.
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