Why do birds sing at dawn?

During the dawn chorus, female birds listen to each song and visit each territory before deciding on a male to mate with.

Dawn is the best time to sing because the air is generally calmer and sound transmission is good. A dawn song is thought to be 20 times more effective than singing at midday and at dawn, birds can do little else.

Female birds generally lay eggs in the morning, so a dawn mating is the best time for a male.

Source: http://uk.answers.yahoo.com/question/index?qid=20070727110559AAyYo72

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