<i>Aythya collaris</i> Length: 17" <p> The Ring-necked Duck is a diving duck and has similar coloration to the Tufted Duck. The Ring-necked Duck has a peaked head instead of a head tuft. The Ring-necked also a a white ring at the base of the bill. </p> <p> They eat aquatic plants as well as some molluscs, aquatic insects and small fish. </p>