The Changchengornis fossil
Changchengornis is named for the Chinese term for the Great Wall (Chang Cheng), which lies just south of the region in which the fossil was found. This blue jay-sized, toothless bird differed from Confuciusornis in having a strongly curved beak and a lower jaw that was very deep at the back and much shorter than the skull. Its large sternum was flat without a keel. There was no tailfan, but its tail bore two long, ribbon-like feathers. Changchengornis's foot structure also indicates a well-developed perching ability.
THE GEOLOGICAL MUSEUM OF CHINA