"I'm a failure as a woman. My men expect so much of me, because of the image they've made of me- and that I've made of myself- as a sex symbol. They expect bells to ring and whistles to whistle, but my anatomy is the same as any other woman's and I can't live up to it."

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Bird taxonomy is a difficult field because of the severe anatomical constraints imposed by flight. There are only so many ways to design a bird capable, say, of catching insects in mid-air, with the result that birds of similar habitats tend to have very similar anatomies, whatever their ancestry. For example, American vultures look and behave much like Old World vultures, but biologists have come to realize that the former are related to storks, the latter to hawks, and that their resemblances result from their common lifestyle.

— Jared Diamond