Fuglenes oprindelse: Forskelle mellem versioner
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'''Fuglenes oprindelse''' kan undersøges takket være en række fundne uddøde fugleslægter, der har mange særlige skeletkendetegn.
En del tyder på at fugle stammer fra en bestemte gruppe dinosaurer,<ref>[http://www.sciencedaily.com/releases/2012/05/120530212105.htm The University of Texas at Austin (2012, May 30). Evolution of birds is result of a drastic change in how dinosaurs developed. ScienceDaily] Citat: "..."We looked back approximately 250 million years, to the [[Archosaur]]s, the group which gave rise to crocodiles and alligators as well as modern birds...
<ref>[http://www.dinodatabase.com/dinothry01.asp dinodatabase.com: Flying Dinosaurs] Citat: "...pterosaurs...were not dinosaurs, although they were related to them; they were flying reptiles..."</ref>
, som ikke engang var dinosaurer, omend nært beslægtede til [[dinosaur]]er.
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