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Scientists have long known that ants lay down scent trails, using pheromones, to mark the trail to goodies for their nest mates. While this is an efficient method for food gathering, it has been found that when a food source is exhausted, the ants leave a "Do not enter" sign that saves fellow ants from wasting time on this trail.
Ref: Science News, 11/26/05, pp. 340-342, S. Milius, "Unway Sign." Illustration: Leaf cutter ans by Pjt56 (Wikimedia CC BySA 4.0)
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