評論
打印
Most people assume that roosters are programmed to crow at the first sign of sunlight to announce the dawning of a new day, or some such romantic notion.
大多數人都會認為每當第一縷陽光照耀大地，公雞就會按規律打鳴表示嶄新一天的開始。除此之外還有很多關于此浪漫的傳說。
Like all birds, roosters call in a daily cycle determined by circadian rhythms.
和其他鳥類一樣，公雞每天打鳴的習慣是由生理節律所決定。
That is, a rooster's internal clock allows it to anticipate the sunrise and prepare for another exciting day of looking for food.
公雞的生物鐘讓它期待日出，以此為契機開始新一天的覓食。
But why must roosters crow as they prepare to start their day, and why do some roosters sound off before dawn?
但是，為什么公雞會打鳴，而且這一時間點是在黎明前呢？
Roosters are territorial creatures and don't much like other roosters trespassing on their land.
公雞是具有領地意識的動物，決不許其它公雞侵犯自己的領地。
They crow in order to establish their domain and warn other roosters to stay away or prepare to brawl.
為了守護自己的地盤，警告其它公雞遠離進而避免爭斗。
And because their internal clocks are sometimes set a bit early, some roosters begin crowing well before sunrise.
而且公雞的生物鐘有時候設置得早一些，所以有些公雞是在日出前打鳴。
