克鲁教授称这个答案是受到鸟类的启发。
与灵长类动物相比，鸟类的大脑太小了。
我必须保护它们不受野生动物和鸟类的伤害，所以我在它们周围筑了一道篱笆。
I had to protect them from wild animals and birds, so I made a fence around them.
因此，关于鸟类的起源、恐龙和早期鸟类的生物学特性等一系列未解之谜都笼罩在困惑之中。
Confusion consequently reigns over a broad spectrum of unanswered questions dealing with avian origins and the biology of dinosaurs and early birds.
Sherwin最近对家养母鸡的实验并不支持这样一种观点，即鸟类的社会学习必然会促使它们对有害或有毒的新食物产生反感。
Sherwin's recent experiments with domestic hens do not support the notion that avian social learning necessarily facilitates aversion to novel foods that are noxious or toxic.
对非外来物种的研究没有得到类似的结果，这使得研究人员推测鸟类的社会学习能力可能与哺乳动物的社会学习能力有根本性的区别。
Studies on nonalien species have not produced similar results, leading researchers to speculate that avian social learning may be fundamentally different from that of mammals.
鸟舍现在不能作为鸟类的家了。
他找了一些鸟类的视频给怀亚特看。
对鸟类的研究可能会对睡眠提供独特的见解。
其中的一些小型哺乳动物有助于维持金鹰等大型鸟类的生存。
Some of those small mammals help to sustain such big birds as golden eagles.
鸟类的第二根手指是翅膀的主要支柱，翅膀主要由羽毛组成。
In birds the second finger is the principal strut of the wing, which consists primarily of feathers.
但所有的考古项目都发现了大量鸟类的骨头，甚至还有鱼的小骨头。
But all the archaeological projects found plenty of bird bones and even tiny bones from fish.
雌性鸟类与雄性鸟类有相同的图案，但是雌性鸟类的颜色更暗淡一点。
The female birds have the same pattern as the males, but they are a little duller in color．
灵长类动物和鸟类的大脑沿着不同的轨迹进化，但最终拥有相似的能力。
Primates and birds' brains have evolved along different tracks, but ended up with similar abilities.
知更鸟认为他对他们胡言乱语，因为他们不够聪明，听不懂鸟类的语言。
The robin thought he spoke this gibberish to them because they were not intelligent enough to understand feathered speech.
所有的考古项目都发现了大量鸟类的骨头，甚至还有一些鱼的细小骨头。
All the archaeological projects found plenty of bird bones—and even some tiny bones from fish.
这些树木成为新的野生动物如鸟类的家园，并且为更多的动物提供食物。
The trees become home to new wildlife, such as birds, and provide food for more animals.
世界上大部分鸟类的繁殖季节即将到来，紧随其后的就是幼鸟出生的季节。
Breeding season is underway for most of the world's birds, with hatchling season close behind.
如果鸟类的瞳孔时不时地变大变小，这可能是它们兴奋、害怕或生气的迹象。
If birds make their pupils large and small from time to time, this can be a sign that they are excited or scared or angry.
但是，这一点很重要，它们的繁殖量与那些只有父方抚养幼儿的鸟类的数量相当。
But, and this is important, their clutch volumes matched those of birds that have only male parental care.
由于这项研究，研究人员现在坚信，这些鸟类的雄性养育行为可能起源于恐龙的行为。
Researchers now believe, because of this study, that the male parenting behavior of these birds might have its origins in the behavior of dinosaurs.
来自澳大利亚、加拿大和美国等国家的科学证据清楚地表明，这种鸟类的数量下降了。
The scientific evidence from countries like Australia, Canada, and the USA clearly indicates a decline in the birds' numbers.
据记录，在美国的风力发电场中，目前猛禽和其他鸟类的死亡总数每年不超过300只。
Recorded deaths of birds of prey and other birds in wind farms in the United States currently amount to no more than 300 per year.
哺乳动物将营养物质输送到骨细胞的微小管道是平行排列的，而鸟类的管道则是随机排列的。
Whereas in mammals the tiny tubes that convey nutrients to bone cells are arrayed in parallel lines, in birds the tubes form a random pattern.
甲虫幼虫含有独特的化学成分，从猎食它们的鸟类的羽毛和血液中可以找到这种成分的痕迹。
The beetle larvae have a distinct chemical make-up, which can be traced through the feathers and blood of birds that eat them.
我今天要讲的是对一种特殊鸟类的研究——新喀里多尼亚乌鸦，它的自然栖息地是太平洋上的小岛。
I'm going to talk today about research into a particular species of bird—the New Caledonian crow, whose natural habitat is small islands in the Pacific Ocean.
他进行关于鸟类的研究，经营网站来教人们鸟类相关的知识以及帮助它们的方法，并为鸟儿制作箱子。
He does research about birds, runs a website to teach people about birds and how to help them, and builds boxes for birds.
风力涡轮机对鸟类的伤害使主张保护野生动物的环保主义者与提倡可再生风能的环保主义者陷入了对立。
The killing of birds of prey by wind turbines has pitted environmentalists who champion wildlife protection against environmentalists who promote renewable wind energy.
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