What does a rooster crow at night?

The rooster crows as follows at night.

It is because the crowing of roosters at night and light stimulation change the normal secretion of an endocrine organ. There is a folk saying that it is an abnormal behavior for a rooster to crow at night. In fact, this statement has no scientific basis.

Every living thing has its own biological clock, and chickens are no exception. They set the time for rest and activity by capturing the change of light. The cock controls the biological clock through the pineal gland, which is an endocrine organ located between the brain and cerebellum. The pineal gland is an organ that all vertebrates have. The difference is that the pineal gland of lower vertebrates contains photoreceptor cells similar to the retina, which can accurately capture the changes of light.

Domestic chickens were domesticated from primitive chickens, and these chickens still exist in the wild. Judging from the habits of pheasants, the singing time of male pheasants is mostly concentrated in the early morning and breeding period. According to the research of zoologists, the crow of roosters is actually a way of communication. During the breeding season, roosters crow frequently and can usually be heard all day (except at night). This is because roosters need to call to remind other roosters.