Why does a rooster crow loudly at daybreak?

Should we say why does it modulate the pitch when crowing zestfully? Of course the cock (also called rooster) goes on uttering deep throaty sounds throughout the daytime but the daybreak is the most important time for it.

Before starting the day’s activities it shakes off any lingering sleepiness by proclaiming its territorial rights. In loud and clear tones it warns other cocks not to trespass on its territory and to keep away from its hens. Since loud reverberating tones of crowing represent physical strength among the chickens, no wonder those high-decibel sound signals are sufficiently loud to wake up some people. Cock utters different sound signals when communicating with its brood during the daytime.

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