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Author (up) Shimmura, Tsuyoshi; Yoshimura, Takashi url  doi
  Title Circadian clock determines the timing of rooster crowing Type Journal Article
  Year 2013 Publication Current Biology Abbreviated Journal  
  Volume 23 Issue 6 Pages R231–R233  
  Keywords animals; rooster; bird  
  Abstract Crowing of roosters is described by onomatopoetic terms such as ‘cock-a-doodle-doo’ (English), ‘ki-ke-ri-ki’ (German), and ‘ko-ke-kok-koh’ (Japanese). Rooster crowing is a symbol of the break of dawn in many countries. Indeed, crowing is frequently observed in the morning [1] . However, people also notice that crowing is sometimes observed at other times of day. Therefore, it is yet unclear whether crowing is under the control of an internal biological clock, or is simply caused by external stimuli. Here we show that predawn crowing is under the control of a circadian clock. Although external stimuli such as light and crowing by other individuals also induce roosters’ crowing, the magnitude of this induction is also regulated by a circadian clock.  
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  Call Number LoNNe @ schroer @ Serial 1600  
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