為什么鳥兒在黎明歌唱？

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Wake up early enough and， depending on where you live， you'll likely hear a pleasant chorus of birds. Singing in the early morning is an instinctive behavior of birds， but why？

This early singing is known as the dawn chorus，and it can start as early as 4 am and last for several hours. Birds do it to attract mates and warn other birds to avoid their turf. One theory as to why they opt for the wee hours to communicate these important messages is because the low visibility makes it hard to do other bird activities， like foraging. Keeping their activity level low， they opt to sing instead.

Another theory argues that birds use the morning vocals to project an image of strength. By singing with enthusiasm， they're letting other birds know they survived the night-no guarantee innature-and would make for an excellent mate.

如果你早上起得夠早，并且住在合適的地方，你很可能會聽到一陣悅耳的鳥鳴。（剩余1546字）