Despite the rooster crow before dawn and alarm clock seems to rule, however, why the birds will be driven by the problem of forecasting the dawn has no answer. After all, the cock will not crow at any random time of day. Now, Japanese scientists reveal the causes of this phenomenon.


To find out just because the rooster crowing and respond to external stimuli, or by the driver based on the intrinsic circadian rhythms - periodic behavior within 24 hours, the team will flock of chickens into a room and continuously applied to the dim lighting, track tweet these poultry within a month.


The test results show that despite the lack of daily light and dark cycle, these birds come and go really controlled by the noise of the internal clock. However, with time, they become scattered tweet, indicating that adapted to the new environment after the dim light, circadian rhythm they eventually disappeared.]