Origin of dinosaurian flight and the rise of birds

For a long time the evolution of birds and the evolution of flight in dinosaurs were essentially the same question. However, recent discoveries have decoupled these two questions, strongly suggesting flight evolved multiple times in the Dinosauria. In the Mesozoic birds were only one group of flying dinosaurs – early birds were very different from modern birds. Exceptional discoveries from China reveal the evolution of the key features that differentiate crown birds from all other amniotes.