1) Bird genus 2) Canvasback 3) Diving duck 4) Genus aythya 
Aythya is a genus of diving ducks. It has twelve described species. The name Aythya comes from the Ancient Greek word aithuia, which may have referred to a sea-dwelling duck or an auklet. Aythya shihuibas was described from the Late Miocene of China. An undescribed prehistoric species is known only from Early Pleistocene fossil remains found at Du...
[n] - canvasback
genus Aythya noun canvasback; redhead; pochard; etc.