Kind of depends on the type of ant. Here in the south we have fire ants. They have huge colonies underground that can can span a large area. You don’t see them except a mound here and there particularly after the rain. But given how long their tunnels are for one colony, 20 meters may still be home territory. If you took an ant far enough it can’t get back to its colony it will eventually just die. Won’t last long without the colony.
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