These animal paper models are two Smews, designed by zardoz. The Smew is a species of duck. It is somewhat intermediate between the typical mergansers and the goldeneyes, the only member of the genus Mergellus. Sometimes included in Mergus, this genus is distinct and might actually be closer to the goldeneyes. The Smew has interbred with the Common Goldeneye.
An unnamed fossil seaduck, known from a humerus found in the Middle Miocene Sajóvölgyi Formation of Mátraszõlõs, Hungary, was assigned to Mergus. However, the authors included the Smew therein, and consequently, the bone is more properly assigned to Mergellus - especially as it was more similar to a Smew's than to the Bucephala remains also found at the site.
It is sometimes argued that the Mátraszõlõs fossil is too old to represent any of the modern seaduck genera, but apparently these were all well-distinct even back then. Fossils from the earliest Pleistocene found in England indicate that the living species was extant 1.5 to 2.0 million years ago. For more information please click here.