Did the sinosauropteryx fly?
Sinosauropteryx
Sinosauropteryx (meaning "Chinese reptilian wing", Chinese:中华龙鸟; pinyin:Zhōnghuá lóng niǎo; literally: 'Chinese dragon bird') is a compsognathid dinosaur. Described in 1996, it was the first dinosaur taxon outside of Avialae (birds and their immediate relatives) to be found with evidence of feathers. It was covered with a coat of very simple filament-like feathers. Structures that indicate colouration have also been preserved in some of its feathers, which makes Sinosauropteryx the first non-avialian dinosaurs where colouration has been determined. The colouration includes a reddish and light banded tail. Some contention has arisen with an alternative interpretation of the filamentous impression as remains of collagen fibres, but this has not been widely accepted.
Sinornis
The first thorough review of "Sinornis" and "Cathayornis" was published by Jingmai O'Connor and Gareth Dyke in 2010. O'Connor and Dyke concluded that despite the 2001 paper by Sereno and colleagues, the two birds were not synonyms and in fact differ in several clear ways, including different proportions in the wing claws and digits, differences in the pelvis, and size of the pygostyle.
The holotype skeleton of both "Cathayornis y." and "Sinornis" was discovered in China, but in different regions. Their skeletons are small, so they were preserved similarly using molds and casts to facilitate the study the specimens.