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March 20 2013
The rooster's morning cock-a-doodle-doo is driven by an internal clock, finds new research, suggesting the male chickens really know the time of day.
The study, detailed today (March 18) in the journal Current Biology, found that roosters put under constant light conditions will still crow at the crack of dawn.
Past studies have found that a myriad of animal behaviors are driven by an internal clock: at night, a dip in insulin causes humans to process food more slowly, and even blind cave fish use a circadian clock to tell time.
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