Why do we have a dawn chorus?

The song of the birds at dawn has given pleasure to millions of people and has been celebrated in poetry and prose for many years. The most usual explanation given in the Middle Ages was that the birds sang each day in praise of God and the beauty with which He had clothed the world. More recently, there was the feeling that the birds sang joyously to welcome the rising of the sun, which meant food,warmth and activity.
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