Greater Scaup

Aythya marila

The Greater Scaup nests furthest north of all diving ducks. Their summer homes are in high latitudes in North America and Asia. Winters are spent in coastal zones further south, yet still in the northern hemisphere. The populations have diminished recently, and though the reasons are not fully understood, some believe coastal pollution is a factor.

The Lesser Scaup and the Greater Scaup are difficult to distinguish. Head shape is one way to differentiate them, but winter habitat can help too. The Greater is more of a saltwater bird and the Lesser is more of a freshwater bird.