美國古生物學家在阿根廷發現了距今2.3億年前的恐龍化石，它們屬于一種名為Eodromaeus的新恐龍，這種恐龍外形與始盜龍相似，身長只有約4英尺，頸骨還有氣囊，這給獸腳類恐龍最終進化為鳥類增添了更多證據。

A new species of dinosaurs has been discovered in Argentina. This finding also proves another revelation, because the fossils are believed to be the earliest link to modern-day birds.
Named Bicentenaria Argentina, the species measures between 2.5 and 3 meters long, and is slim and agile. The shape of its sharp curved teeth and long claws suggest Bicentenaria hunted other smaller dinosaurs. Scientists say the carnivorous dinosaur represents a new line leading to the evolution of modern day birds.
It may even have been partially or completely covered in feathers itself. The 130 bones were discovered in Rio Negro in Argentina's Patagonia region and are thought to be approximately 90 million years old. Paleontologists believe that Bicentenaria lived during the Cretaceous period when the earth was dominated by large dinosaurs.