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As explained on the page for , different authors have disagreed significantly about the most appropriate usage for the formal "Aves" (birds). The two most common usages are probably:
(1) For the of "birds" including the "Urvogel" and modern birds, as well as all fossil taxa generally described as "birds", see .
(2) For the of modern birds, including only those fossil birds that lie within the crown, see (this taxon is also known as ).
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