AOL.com Video - How Do Roosters Know Its Dawn?

VIDEO:Knowledge

How Do Roosters Know Its Dawn?

Description:Researchers from Nagoya University in Japan have shown that roosters crowing at dawn are regulated by circadian rhythms and internal genetic body clocks. Takashi Yoshimura of Nagoya University, who worked on the study, said: “it wasn’t clear whether crowing is under the control of a biological clock or is simply a response to external stimuli.” (1:10)

Source: GeoBeats

Tags: GeoBeats , roosters based on circadian rhythms , when roosters know it is dawn , why roosters caw