The Rooster
"Okeydoke"
March 21, 2013
Japanese researchers (click here) say they have proof that an internal biological clock -- the so-called Circadian rhythm -- plays a role in letting roosters know when it's time for their morning crow....
..."'Cock-a-doodle-doo' symbolizes the break of dawn in many countries," says Takashi Yoshimura of Nagoya University. Writing in the journal Current Biology, Yoshimura added it's not clear whether crowing is under the control of a biological clock or is simply a response to external stimuli.
Yoshimura notes that roosters don't only crow at dawn, but also at other times of the day, which suggests that external factors, such as the stray glare of a car's headlights, or the sound of another rooster crowing nearby, can motivate the bird's vocalizations....
