美国古生物学家在阿根廷发现了距今2.3亿年前的恐龙化石，它们属于一种名为Eodromaeus的新恐龙，这种恐龙外形与始盗龙相似，身长只有约4英尺，颈骨还有气囊，这给兽脚类恐龙最终进化为鸟类增添了更多证据。

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.