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。
The researchers hypothesize that crows learn to recognize threatening humans from both parents and others in their flock.
鸦科动物和一些哺乳动物有未雨绸缪的能力，比如把食物储存在它们以后能找到的地方。
Corvids and some mammals have the ability to plan for the future, to store food for instance, in places where they can find it later.
鸦科包括渡鸦、松鸦、乌鸦和喜鹊。
那么关于鸦科动物和黑猩猩的实验告诉了我们什么呢？
因为鸦科动物有其他的认知技能，研究人员想看看它们是否也有镜像自我识别的能力。
Because corvids have these other cognitive skills, researchers wanted to see if they were also capable of mirror self-recognition.
克莱顿的实验要求松鸦根据一个独特的学习事件来记住所储存食物的类型、位置和新鲜程度。
Clayton's experiment required jays to remember the type, location, and freshness of stored food based on a unique learning event.
事实上，有研究表明，以偷别人食物而闻名的鸦科动物会隐藏自己的食物，正是因为它们把自己偷东西的倾向投射到其他鸦类身上。
It's been suggested in fact that jays, corvids known for stealing each other's food, may hide their food precisely because they are projecting their own tendency to steal onto other jays.
新西兰森林中最美妙的声音便是垂耳鸦纯净、银铃般的叫声。
One of the most beautiful sounds of the New Zealand forest is the clear, bell-like call of the Kokako.
曲终四顾无人听﹐三五归鸦自在飞。
When my song ends, I look round, finding no one’s listening; Only three or five returning crows are flying, so carefree.
薄暮时分，鸦群飞向光秃秃的橡树枝条上过夜。
In the gloaming, the crows flew in to gather for the night in a stand of bare oaks.
她想着那只老蓝鸦今天会不会再来这里。
说完三只蓝鸦飞走了。
直到19世纪，麻鸦曾在欧洲西部和中部很普遍。
The bittern was common in west and central Europe until the 19th century.
狼老被鸦欺。
最小的蓝鸦接着说：“上山的路是艰难的，下山的路要容易得多。”
The smallest jay said: "On the way up, this will be difficult. But on the way back, it will be easy."
由于冠蓝鸦的颜色与周围的一切人和物一致，人们对它的兴趣开始减退。
And because the Blue Jay was a color like everybody and everything else people began to lose interest.
他相貌平平：个头跟蓝松鸦差不多，深绿褐色的羽毛，头上有橙色的条纹。
He isn't much to look at: a blue jay-size fellow with plain, olive-drab feathers and a single streak of orange on his head.
在世界变成紫色刚好一年后，人们一觉醒来发现世界又变成了黄色，除了那只冠蓝鸦。
It was exactly one year to the day after the world had turned violet that people awoke to find the world had turned yellow. All except the Blue Jay.
三只老蓝鸦落在窗沿上分享着它们白天的见闻。明亮的月光照着它们，显得分外朦胧。
Three old bluejays had alighted there (looking rather misty in the bright moonlight) to talk together and share their news of the day.
乌鸦科(鸦科)的鸟类尤其易感，但已在250多种死亡和濒临死亡的鸟类中检测出该病毒。
Members of the crow family (Corvidae) are particularly susceptible, but virus has been detected in dead and dying birds of more than 250 species.
只不过现在那只冠蓝鸦愈发重要了，因为还是只有它保持着原来的蓝色。人们又一次为其意义争论不休。
Only now the blue Jay was more important than ever because he alone had stayed the color blue and people argued about what that meant.
接下来的几个月，研究人员和志愿者不时戴着面具在校园内出没，他们按照规定路线行走，也没有故意惊扰鸦群。
In the months that followed, the researchers and volunteers donned the masks on campus, this time walking prescribed routes and not bothering crows.
我非常欣赏科学家们的创造力，他们能测试八哥的乐观和悲观，测试灌丛鸦和草甸田鼠的情景记忆，测试老鼠的欢乐。
I really enjoy the ingenuity of scientists testing optimism and pessimism in starlings, episodic memory in scrub jays and meadow voles, joy in rats.
但是，偶尔他们会想冠蓝鸦飞去了哪里，现在过得怎样，最重要的是，它是否依然是那鲜艳的蓝色，以及曾经发生的一切究竟意味着什么。
But on occasion they wondered where the blue Jay had gone and how he was doing and, most of all, if he was still the color blue and what it had all meant.
我从来不是赏鸟人，尤其不是兴趣这个字眼的意义上的赏鸟人。但是，去年夏天，我们所住的地方每天早上都有一只冠蓝鸦到访，使我很快喜欢上了。
I've never been a bird-watcher in the hobby sense of the word but last summer I took a special liking to a little blue jay that came by our place every morning.
我从来不是赏鸟人，尤其不是兴趣这个字眼的意义上的赏鸟人。但是，去年夏天，我们所住的地方每天早上都有一只冠蓝鸦到访，使我很快喜欢上了。
I've never been a bird-watcher in the hobby sense of the word but last summer I took a special liking to a little blue jay that came by our place every morning.
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