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.

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。

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In birds the second finger is the principal strut of the wing, which consists primarily of feathers.

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。

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The birds, the people, the blueness of the sky, the clouds floating along, the smell of the fresh air, and the warmth of the sun on your cheeks.

鸟儿、人们、蓝蓝的天空、漂浮的云彩、新鲜空气的气息，还有映照在你脸上的暖阳。

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One of the birds they can see is America's national symbol, the bald eagle.

VOA: special.2009.02.16

He went out and saw his mum in the trees, in the clouds, or when the birds were singing.

他走出去，看到自己的母亲,在树上，在云里，在鸟儿的歌声中。

普林斯顿公开课 - 人性课程节选

and he looks after wild birds of prey and does the bird shows.

他照看野生鸟的捕食情况、训练鸟类表演。

喜欢鸟 - SpeakingMax英语口语达人

For two years now, that basic, terrestrial formula was enough to make Angry Birds the de facto king of mobile gaming, and a stand-in for a casual gaming revolution that was gripping phone users and proving a full-fledged commercial phenomenon.

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It has been known for years that in a range of animals from insects to birds the males increase the quality and quantity of the sperm they ejaculate when those sperm are likely to find themselves in competition with sperm from another male.

ECONOMIST: Sex: Twin peaks | The

"Breeders tell us that not all of their birds come back from every race, and so these are the birds with the greatest potential to escape and contribute to the free-living population, " Dr Shapiro said.

BBC: Pigeon DNA gives up fancy secrets