Experiments show that rooster crowing is controlled by internal biological clock, but external light and sound stimulation can also induce rooster crowing, but the influence of external stimulation on rooster crowing is also controlled by internal biological clock.

When the period of light and dark changes, roosters show the same time difference as people flying over a big time zone. This is because the biological clock of chicken, like that of human, is influenced by melatonin secreted at night (in darkness). At the same time, cock crowing is also related to chicken androgen. Capons and hens can't crow precisely because they don't have androgen. If they are injected with androgen, hens will also start to crow.

Extended data

Except for a few birds, such as owls and Siniperca chuatsi (a bird of prey similar to owls, the difference is that owls have two feathers similar to cat ears on their heads, but Siniperca chuatsi does not), other birds are invisible at night. So is the rooster. At night, they may be attacked at any time, so they feel very uneasy.

In the morning, the rooster's eyes can see again, so he is very excited. In order to express this excitement, I began to sing excitedly. This is also the rooster's instinctive response to light stimulation. After a long time, morning singing has become a habit of roosters. Even if the rooster is placed in a dark place so that it can't see the light, it will still crow in the morning.

In addition, the rooster is also a very aggressive animal. It warns other cocks not to come to its territory by crowing, otherwise it is impolite. The rooster will crow to attract the attention of the hen and remind her that there is a handsome guy here, but don't go anywhere else. In a word, rooster crows have many different meanings, so the way of crowing is also very different.

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