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Deby Cassill in 2009 broke with tradition and calls certain periods of rest in ants sleep.. Working with fire ants, she videotaped ants in an artificial nest. She created an artificial colony with three queens, 30 workers and 30 larvae. Checking the posture and position of the antennae, she concluded that queens sleep 90 times per day for 6 minutes per nap, whereas workers dosed 250 times per day for roughly one minute at a time.
These are the workers. Among their main tasks are to forage, clean, and feed the larvae. All worker ants are female and live for a month. Typically, colonies have about 5,000 worker ants but can have as many as 15,000. Each colony has one queen, which has been known to live for up to 29 years (source). The lifespan of Worker ants, on the other hand, stretches from two to three years on average.