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Some official bodies have adopted the proposed Sibley-Ahlquist taxonomy almost entirely, however a more common approach worldwide has been to retain the traditional groupings, and modify rather than replace them in the light of new evidence as it comes to hand.

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Some official bodies have adopted the proposed Sibley-Ahlquist taxonomy almost entirely ; however, a more common approach worldwide has been to retain the traditional groupings, and modify rather than replace them in the light of new evidence as it comes to hand.

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