Gansus
Gansus is a genus of  aquatic birds that lived during the Lower Cretaceous period, between 115 to 105 million years ago (mya). It was found in what is now Gansu province, western China. It is the oldest-known of the Ornithurae, the group which includes modern birds (Neornithes) and extinct related groups, such as Confuciusornis, Ichthyornis and Hesperornis.