Cretaceous life. Computer artwork of a number of different prehistoric creatures that existed during the Lower Cretaceous period (between 146 and 98 million years ago) in the Yixian Formation, Liaoning, China. These include: Sinovenator changii (lower centre), Psittacosaurus meileyingensis (centre right), male and female Confuciusornis sanctus (upper left and upper centre), Protopteryx fengningensis (red, flying), and Liaoxitriton zhongjiani (lower left corner).