Sound signals are extremely important in the life of birds. They ensure the protection of their territory from the invasion of strangers (that is, in fact, the provision of food resources), attracting a female for breeding, saving congeners and chicks from impending danger. In the language of birds, there are dozens of sound signals (distress, warnings, food, courtship, mating, aggressive, gregarious, nesting, and so on).
For example, birds of prey (eagles, owls) widely use beak clicking as a threat signal.
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