Genus Sinornis is a type of bird that lived during the Early Cretaceous period in what is now China. There are several synonyms used to refer to this genus, including Sinornis santensis, Sinornis haoae, and Sinornis liupanshanensis. These different names were given based on various characteristics of the fossils found, such as their size, shape, and location. While the genus Sinornis is not particularly well-known outside the scientific community, it represents an important piece of the puzzle in understanding the evolution and diversity of birds throughout history. Its various synonyms serve to highlight the subtle differences between the various specimens that have been discovered over time.