What could have caused the crows to caw?
什么能让乌鸦叫的？
At dawn, the crows flew back to their lair.
天亮了，乌鸦飞回了他们的巢穴。
Corvids include ravens, jays, crows and magpies.
鸦科包括渡鸦、松鸦、乌鸦和喜鹊。
We first discovered the crows on Friday morning.
我们第一次发现乌鸦是在星期五早上。
It seems that these crows are exceptionally resourceful.
这些乌鸦看起来似乎特别聪明。
As a further precaution, all the crows had been fed beforehand.
作为进一步的预防措施，所有的乌鸦都预先喂过食。
Significantly, the crows tended to use the sticks only to make their first contact with the object.
值得注意的是，乌鸦倾向于仅在初次与对象接触中使用小棍子。
Scientists have collected samples from crows in order to estimate the proportion of larvae in their diet.
科学家们从乌鸦那里收集了样本，以估计它们食物中幼虫的比例。
The researchers hypothesize that crows learn to recognize threatening humans from both parents and others in their flock.
研究人员猜测，这些乌鸦从父母和鸦群的其它成员那里学会了辨认有威胁的人类。
We've learnt a great deal about the ability of New Caledonian crows to use tools, and some very interesting research is being carried out into them.
我们已经了解了很多关于新喀里多尼亚乌鸦使用工具的能力，并且正在对它们进行一些非常有趣的研究。
Subsequently, the crows either ignored the object or dropped the tool and pecked at the object—which is very different from using the tool to get access to food.
随后，乌鸦要不就无视了该对象，要不就把工具丢到一边，然后用喙猛啄该对象——这和用工具觅食有很大不同。
Further experiments carried out at Oxford suggest that crows can also use sticks as tools to inspect all sorts of objects, possibly to assess whether or not they present a danger.
在牛津大学进行的进一步实验表明，乌鸦也会用棍子作为工具来检查各种物体，可能是评估它们是否构成危险。
So scientists want to find out much more about how the crows behave in their native habitat, and a team from Exeter and Oxford universities is carrying out research in New Caledonia.
因此，科学家们希望更多地了解乌鸦在它们的自然栖息地是如何活动的，而埃克塞特大学和牛津大学的一个研究小组正在新喀里多尼亚进行研究。
The cock crows and the dawn chorus begins.
公鸡叫了,众鸟的清晨鸣唱随之开始了。
First he imitated the voices of newly hatched crows.
一开始，他模仿了刚孵出的乌鸦的叫声。
He showed how crows call when they are happy and cheerful.
他向人们展示了乌鸦在高兴的时候是怎么叫的。
The arrival of the two crows broke the order of the writer's life.
两只乌鸦的到来打破了作者的生活秩序。
The crows caw when moon goes down.
月落乌啼。
公鸡在黎明时打鸣儿。
"Did you hear that?" she crows.
你听见了么？
When the Wolf grows old, the crows ride him.
狼老被鸦欺。
When you get older, crows' feet often form around your eyes.
你年纪大的时候，鱼尾纹常常会在你的眼周显现。
It was identified in birds (crows and columbiformes) in Nile delta region in 1953.
1953年，尼罗河三角洲区域的鸟类(乌鸦和鸽子)中首次发现该病毒。
His research team, however, soon learned that the crows weren't easily fooled twice.
然而，他的研究团队很快发现乌鸦不会第二次再轻易上当。
If you can't find someone to talk to, then do what crows do when they're alone: Sing.
如果你真是找不到个能说话的人，那就做乌鸦孤单时做的事吧：唱歌。
In the gloaming, the crows flew in to gather for the night in a stand of bare oaks.
薄暮时分，鸦群飞向光秃秃的橡树枝条上过夜。
And crows eventually come by, and eat the peanuts and get used to the machine being there.
乌鸦来了，吃掉机器上的花生，并且习惯于机器的存在。
And crows eventually come by, and eat the peanuts and get used to the machine being there.
乌鸦来了，吃掉机器上的花生，并且习惯于机器的存在。
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