English: There was once much controversy surrounding the evolution of birds, as relevant evudence was lacking. However, as fossil evidence of intermediary species between dinosaurs and birds, such as Archaeopteryx, Anchiornis, Sinosauropteryx, and Caudipteryx, continues to emerge, the origin of birds is gradually becoming less of a mystery. Now, sccientists hold the view that, "Birds are a group of theropod dinosaurs that possess feathers and evolved the ability to fly."