Unlike humans, some birds have independently evolved to flourish on sugar-rich nectar &fruit without ill effect. In a new Science study, researchers find that these bird species share convergent evolutionary changes in key physiological traits and metabolic genes that enable their high-sugar diets.

· · 来源：tutorial百科

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“最后可能又是烂摊子”，美伊冲突何时了？

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The people of the world saw their planet as the astronauts saw it - fragile and beautiful, shining in the desolation of space.

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