The blue sky and white clouds, hope pigeon flying freely.

蓝天和白云一样，希望白鸽自由地飞翔。

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One blue pigeon sitting on a wall.

一只蓝色的鸽子蹲坐在一堵墙上。

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From the plebeian pigeon to the rarest bird of all. The Spix's macaw, or the little blue macaw, may be the most endangered bird in the world.

从最普通的家鸽到最罕见的鸟类中，斯皮克斯金刚鹦鹉，又叫做小蓝金刚鹦鹉，绝对是世界上最为濒危的鸟类。

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When you picked one up didn't matter whether it was a prosaic pigeon feather or a small, sharp, handsome Blue Jay feather no one needed to tell you that you beheld something precious in your hand, something whose impossible lightness and delicacy held valuable lessons, even if you didn't quite know what they were.

WSJ: Of Feathers, Showgirls and Biology