From Justapedia - Reading time: 2 min
Dinosaurs are a group of reptiles that dominated terrestrial ecosystems for over 160 million years, from around 230 million years ago until 66 million years ago, at the end of the Cretaceous period,[1] when all non-avian dinosaurs became extinct. Dinosaur remains have been found on every continent, including Antarctica. Vertebrate paleontology has become a global science, with major new discoveries in previously unexploited regions, most significantly the well-preserved feathered dinosaurs in China which have further solidified the link between the extinct non-avian dinosaurs and birds, the present-day avian dinosaurs.