Unlabelled: Humidity levels, like light and temperature, fluctuate daily yet are less predictable; however, whether humidity entrains circadian clocks and enables animals to synchronize behaviors to environmental variations remains unknown. Here, we investigate the circadian humidity entrainment in various insects. Multiple species robustly respond to humidity cycles, and when the humidity cue is removed, their rhythmic behaviors continue, suggesting that humidity-associated rhythmic activities are under circadian control.
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