A fossilized bird dating back about 110 million years is discovered in Yumen, Northwest China's Gansu Province. (Photo/China News Service.com)
This photo shows the dinosaur-era bird fossil with an unlaid egg. (Provided by the Institute of Vertebrate Paleontology and Paleoanthropology of the Chinese Academy of Sciences)
A fossilized bird dating back about 110 million years is discovered in Yumen, Northwest China's Gansu Province. (Photo/China News Service.com)
A fossilized bird dating back about 110 million years is discovered in Yumen, Northwest China's Gansu Province. (Photo/China News Service.com)
Artistic reconstruction of the dinosaur-era birds and their living environment. (Provided by the Institute of Vertebrate Paleontology and Paleoanthropology of the Chinese Academy of Sciences)
