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.
抓住它，小松鸦！小冬青是一只慢毛虫！
晓露鸦初洗，春荷叶半开。
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.
鹰爱高飞，鸦栖一枝。
只见亮闪闪的蓝色羽毛一闪，一只松鸦从刺柏丛中钻了出来。
A jay emerged from the juniper bush in a flash of blue feathers.
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.
新喀里多尼亚鸦制作和使用工具的方式能让普通的家庭管道工自愧弗如。
And New Caledonian crows make and use tools in ways that would put the average home plumber to shame.
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.
“羊有跪乳之恩，鸦有反哺之孝”“一饭千金”之所以流传千古就是因为感恩的美德。
Gratitude, about which there are many touching tales in China, is a virtue inherited since ancient times.
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.
这条无人居住的海岸线上海岛、盐沼和沙滩为冻土天鹅、黑鸦以及其他水鸟提供了完美的栖息地。
All along this uninhabited shoreline, sea islands, salt marshes, and sandy beaches provide a perfect resting place for Tundra swans, coots, gallinules, and other water birds.
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.
一些人说这只冠蓝鸦肯定是一只非同寻常的鸟，或者可能根本就不是鸟类，因为只有它保持了原来的颜色。
Some said the Blue Jay must be a very special bird or maybe not a bird at all because he alone had kept his true color.
一些人说这只冠蓝鸦肯定是一只非同寻常的鸟，或者可能根本就不是鸟类，因为只有它保持了原来的颜色。
Some said the Blue Jay must be a very special bird or maybe not a bird at all because he alone had kept his true color.
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