"If you are recording, you are recording. I don't believe there is such a thing as a demo or a temporary vocal. The drama around even sitting in the car and singing into a tape recorder that's as big as your hand - waiting until it's very quiet, doing your thing, and then playing it back and hoping you like it - is the same basic anatomy as when you're in the recording studio, really. Sometimes it's better that way because some of the pressure is off and you can pretend it's throwaway."

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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