Non-avianDinosaursare a group ofreptilesthat dominatedterrestrialecosystemsfor over 160 million years, from around230million years agountil66million years ago,at the end of theCretaceousperiod,[1]when all non-avian dinosaurs became extinct. Their remains have been found on every continent, including Antarctica.Vertebrate paleontology,and well-preservedfeathered dinosaurs,have further proven thatbirdsare avian dinosaurs.

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  1. ^Renne, Paul R.; Deino, Alan L.; Hilgen, Frederik J.; Kuiper, Klaudia F.; Mark, Darren F.; Mitchell, William S.; Morgan, Leah E.; Mundil, Roland; Smit, Jan (7 February 2013)."Time Scales of Critical Events Around the Cretaceous-Paleogene Boundary".Science.339(6120):684–687.Bibcode:2013Sci...339..684R.doi:10.1126/science.1230492.PMID23393261.