You who live in the mountains or plantations will certainly hear the birds chirp in the morning. Scientists call the event as a dawn chorus phenomenon. Birds usually start activities at 4:00 am and end in a few hours later to find food.
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Although birds can sing all day long, but the frequency of chirp in the morning will sound louder and often. Most of the chirping you hear comes from a male. Usually it is done to attract the attention of the opposite sex and also become a harbinger of territory or territoriality from other males.