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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 slowlyand even blind cave fish use a circadian clock to tell time.

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You need to cock an eye at your teacher when you're in class so that you know what your homework assignments are.

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Of course, roosters crow with the dawn. But are they simply reacting to the environment, or do they really know what time of day it is? Researchers reporting on March 18 in Current Biologya Cell Press publication, have evidence that puts the clock in "cock-a-doodle-doo" or "ko-ke-kok-koh," as they say in the research team's native Japan. That's because other things -- a car's headlights, for instance -- will set a rooster off, too, at any time of day.

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