The origin and early evolution of birds

  title={The origin and early evolution of birds},
  author={Kevin Padian and Luis M. Chiappe},
  journal={Biological Reviews},
  • K. PadianL. Chiappe
  • Published 1 February 1998
  • Environmental Science, Biology, Geography
  • Biological Reviews
Birds evolved from and are phylogenetically recognized as members of the theropod dinosaurs; their first known member is the Late Jurassic Archaeopteryx, now represented by seven skeletons and a feather, and their closest known non‐avian relatives are the dromaeosaurid theropods such as Deinonychus. Bird flight is widely thought to have evolved from the trees down, but Archaeopteryx and its outgroups show no obvious arboreal or tree‐climbing characters, and its wing planform and wing loading do… 


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