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They put out a scent to ward others away if killed. Like use a rolled up piece of packing tape. Then leave the dead ones there as the smell keeps others away.
But really they only look for food. If they can't find food they leave. So keep counters and floors free of food.
Non toxic way to kill large groups of them is liquid dish soap and water in a spray bottle. The bubbles kill them as they can't breathe.
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