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..."That you can have such dramatic success simply by changing the relative timing of events in a creature's development is remarkable," he said. "We now understand the relationship between birds and dinosaurs that much better, and we can say that, when we look at birds, we are actually looking at juvenile dinosaurs."..."</ref> og er meget nært beslægtet med [[Familie (biologi)|familien]] ''[[Dromaeosauridae]]''. Fossile rester af Dromaeosaurer og primitive fugle har mange lighedstræk, og derfor bør alle fugle kaldes for 'flyvende dinosaurer'. Fugle stammer altså '''ikke''' fra [[flyveøgler]]
<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.