Yanornis is an extinct genus of Early Cretaceous bird, thought to be closely related to the common ancestor of all modern birds. One species, Yanornis martini, has been described from fossils found in the Jiufotang Formation at Chaoyang, Western Liaoning province, PRC, and as of 2004, five specimens were known. The age of the Jiufotang Formation is somewhat unclear, but most estimates point towards an early Aptian origin, about 125-120 million years ago.