An integrative approach to understanding bird origins

@article{Xu2014AnIA,
  title={An integrative approach to understanding bird origins},
  author={Xing Xu and Zhonghe Zhou and Robert Dudley and Susan Mackem and Cheng-Ming Chuong and Gregory M. Erickson and David J. Varricchio},
  journal={Science},
  year={2014},
  volume={346}
}
Background The origin of birds is one of the most enduring and dramatic evolutionary debates. The hypothesis that the primarily small-sized birds are nested within a theropod dinosaur group that includes the gigantic Tyrannosaurus rex has been supported by strong fossil evidence, but until recently, several important issues remained unresolved, including the origins of feathers and flight, the “temporal paradox” (the coelurosaurian theropods occur too late in the fossil record to be ancestral… 
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