A mid-sized diving duck, the Greater Scaup is colloquially called "bluebill" in North America and just Scaup in Europe. Greater and Lesser Scaups are often seen together but the larger size of the Greater Scaup distinguishes them from the Lesser Scaup. The Greater Scaups are mid-sized diving birds. Greater Scaup males have a soft, quick whistle and female Greater Scaups have a single pitch, a raspy “arrr-arrr-arrr-arrr-arrr” vocalization.

During breeding, the male greater scaup has black head, neck, upper back, and breast and rump; head with greenish hue, back white to gray, covered with thin, black wavy lines. During nonbreeding, the male has a blackish brown head and neck, lighter on cheeks and chin. Feathers have a white edging and a dark grayish tail. The greater scaup female has a white area at the base of the bill. The head and neck are dark brown with light mottling. Breast is a buffy brown, belly is whitish and the tail is a dark brown.

The PECk-O-MATIC Automatic Duck Feeder provides fresh feed at all times. Fresh feed is one of the most essential aspects of breeding healthy poultry. The suitable size of the regulator disc is ¾ inch or 1inch when feeding corn. Millet and mash can be provided using the ¼ inch regulator disc of the PECk-O-MATIC Automatic Duck Feeder.

The greater scaup has a circumpolar distribution. They breed within the Arctic Circle both in the Old World and in North America. Summer months are spent in Alaska, Siberia, and the northern parts of Europe. The greater scaup breed in the tundra and the boreal forests.