xilihutu
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加入时间: 2007/03/29
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来自: 美国
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作者：xilihutu 在 驴鸣镇 发贴, 来自 http://www.hjclub.org
What makes a rooster decide to crow?
http://www.earthsky.org/faq/why-roosters-crow?q=printme
What triggers a rooster to crow? We live in a rural area, and on certain nights, the roosters in the neighborhood crow hours before dawn.
Like all birds, roosters sing – or crow, as the case may be – in a daily cycle. Almost all animals have daily cycles of activity known as “circadian rhythms.” A rooster crows because he has an internal clock that helps him anticipate sunrise. That way he knows when to begin his daily hunt for food and defense of his territory.
But if one rooster in the neighbor has an internal clock that’s set a little early, he can stimulate other roosters to crow early, too. The rooster’s sunrise song is actually a way of establishing his territory. When a rooster crows, he’s sending a signal to other roosters that if they trespass, they’re asking for a fight. A rooster will often crow from a vantage point above his territory so he can make others more aware of his presence and so that his songs travel farther.
Even though roosters are the most famous crooners of the chicken world, hens aren’t exactly silent. When a hen spots a hawk, she’ll let out a harsh scream to send her chicks into hiding. But if she sees a less-threatening human, she’ll merely cackle.
好像野鸡不打鸣，会不会是野鸡地盘大？夏威夷到处是野鸡，好像也没听见有鸡叫。
那鸡还真可能半夜鸡叫：
| 引用: |
I would like to know why my rooster crows at 3:00 AM. It wakes me up and disturbs my neighbors. Please help with an explanation. Thank you.
— Judy Ann |
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| SDSTAFF Jill commented, "When I lived in Jamaica, I asked why the roosters crowed all night long. The neighbors informed me that roosters crow every hour, on the hour. Now that sounded ridiculous to me, but when I checked, it was true. Well, sometimes it would be like 20 minutes after the hour, but exactly an hour later, they would crow again. Each night it would be about five minutes later than the night before, but always an hour between crows." |
Read on, very interesting... 
http://www.straightdope.com/columns/read/1566/why-do-roosters-crow-early-in-the-morning
作者：xilihutu 在 驴鸣镇 发贴, 来自 http://www.hjclub.org |
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[讨论]公鸡打鸣为哪般？
