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why do roosters crow in the morning

A rooster crows because he has an internal clock that helps him anticipate sunrise. Like all birds, roosters sing в or crow в in a daily cycle. Almost all animals have daily cycles of activity known as
circadian rhythms that roughly follow the cycle of day and night. Roosters anticipate sunrise to get a head start on their daily hunt for food and defense of territory. But if one rooster in the neighbor has an internal clock thatвs set a little early, he can stimulate other roosters to crow early, too.

The roosterвs sunrise song is actually a way of establishing his territory. When a rooster crows, heвs sending a signal to other roosters that if they trespass, theyвre asking for a fight. A rooster will often crow from a vantage point above his territory so he can make others more aware of his presence and so that his songs travel farther. Even though roosters are the most famous crooners of the chicken world, hens arenвt exactly silent, either. When a hen spots a hawk, sheвll let out a harsh scream to send her chicks into hiding.

But if she sees a less-threatening human, she might just cackle. Ever wondered why roosters always crow cock-a-doodle-doo at daybreak? A research published in the journal in 2013 by Tsuyoshi Shimmura and Takashi Yoshimura of Nagoya University in Japan, found that the crowing is mainly regulated by the internal timekeeper (circadian clock) although it is influenced by external stimuli, such as light or other roosters crowing.

Read also: According to, the researchers placed 40 roosters in a room, which had constant light, and then recorded their crowing simultaneously. The result showed that the roosters would crow at dawn and, although they also crowed at other times of the day under influence of the sound of other chickens crowing and light, their circadian clock still dominated the behavior and their crowing sounded stronger in the morning. The team is interested in examining other animal sounds as well. (wir/asw)

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