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"...by using a tracking system to continuously monitor individually tagged ants in six colonies over 41 days, [...] scientists discovered that the insects have created a very orderly career ladder—one that focuses them on the task at hand, not on what lies ahead. Specifically, the ants perform three distinct functions and typically move from one work group to the next as they age. The youngest tend to serve as nurses to the queen, with the next oldest acting as cleaners and the elders going out, foraging for food and other resources."
