ANSWERS: 2
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The ones in the line were following a trail. If an ant finds food, he carries it home, and when he does he releases a pheremone associated with food. Other ants "smell" the trail and follow it back to the food, and take the food homeleaving their own trails of pheremones. Pretty soon the scent is very strong and you have a thick line of ants crawling, unable to be distracted from their task The one's crawling on your foot are probably just scouting.
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How far are they willing to scout on my foot lol
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