Greater Scaup (Aythya marila) – Bluebill Facts

greater scaup

Greater Scaup, with its scientific name, Aythya marila, is called scoop in Europe as well as in North America. However, is it also called ‘bluebill’, and a medium-sized diving duck, larger than the closely related scaups.

It allows the summer months to breed in Alaska, northern Canada, Siberia, and northern Europe,  during the winter it flies to the coasts of South America, Europe, and Japan.

Greater Scaup is larger and has more rounded heads than wives; They have a bright blue bill and yellow eyes. Their heads are dark, gorgeous in green.

The breasts are black, belly white and the wings show a white stripe. The females are mostly brown, while the wings are white with their faces being pale blue and white.

Greater Scaup nests close to the water, usually on the northern lake island or on floating mats. They started breeding at the age of two but started producing nests in the first year.

Drake has a complex court, which takes place during the summer breeding place, and ends with the formation of an exclusive pair. The female lays six to nine olive-buff-colored eggs.

Eggs hatch within 24 to 28 days. The bottom covered dealings are able to follow their mother for her meal immediately after hatching.

Greater Scaup eats aquatic mollusks, plants, and insects that they acquire by submersing them underwater. They form a large group called the “raft”, it can be in the thousands.

Their main threat is human development, though they are hunted by owls, skunks, raccoons, foxes, coyotes, and humans.

Greater Scaup populations have been declining since the 1970s; however, they are still listed on the IUCN Red List as a species of low concern.


The Greater Scaup of adults is 39–56 cm (15–22 inches) in length — 5–1 cm (20–4 wings inches) in length and has a mass of 2–3,660 g (7 mass.2.2 pounds).

It has a blue bill and yellow eyes and is 20% heavier and 10% longer than the closely related low scoop. The male has a darker shade of green head, a black breast, a light back, a black tail, and a white bottom.

Drake or male is Greater Scaup and is more round than female has Drake’s abdomen and flanks are a bright white. The feathers of its neck, breasts, and tail are shiny black, while the lower parts of it are vermiculated gray.

The upper wing has a white stripe that begins as a speculum and extends along with the flight feathers to the wings. The legs and feet of both sexes are gray. The adult female has brown hair and white wings on the head, which are similar to the male but are somewhat lighter.

At the base of the bill it has a white band and brown oval-shaped patches that are somewhat lighter shades of blue than Drake, resembling teenage older scoop adult girls.

The grips plumage of the Greater Scaup drachm looks similar to the plumage of its genus, except the pale parts of the plumage are brownish gray.

It can be difficult for the field to distinguish more from fewer scouts. The larger head tends to be more rounded and the white wings stripe becomes wider.

Distribution and Accommodation

The Greater Scaup has a circumpolar distribution, which breeds both in the Old World (Palaearctic) and North America (nearby) within the Arctic Circle. It spends the summer months in Alaska, Siberia, and northern Europe.

It is also found in Asia and is present year-round in the Aleutian Islands. Summer habitat islands in the wetland lowland tundra and a freshwater lake. In the autumn, the Greater Scaup populations begin their migration to the south for the winter.

They are found throughout the Pacific and Atlantic coasts of North America, the coasts of northwestern Europe, the Caspian Sea, the Black Sea, the Japanese coast, the Yellow Sea, and the East China Sea during the winter months in coastal bays, estuaries, and sometimes inland lakes, such as the lakes of Central Europe and Seen on the Great Lakes.


Tundra and boreal forests breed larger scopes; It is estimated that 75% of the North American population is native to Alaska.

They are usually found nesting on the Great Northern Lakes Island. Greater Scaup starts breeding when they are two years old, though they begin to nest at the first age.

The Greater Scaup of Drake has a soft, fast ladder they use to catch hens during the wedding which occurs on their way back to their northern breeding fields from the end of winter to spring. The female Greater Scaup has a single pitch, a juice descriptive “arrr-arrr-arr-arrrrr” vocalization.

The courtship is the result of a complex and fruitful pairing. The clown’s nest in close proximity to each other in large colonies, usually near water, on an island or coast, or floating vegetation. There is shallow frustration created by the woman at home and tied to the bottom.

After laying the female egg, the drake leaves the female and goes into a large, isolated lake with other dross. This lake may be near or far from the breeding ground. The selected lakes are used annually by the same duck.

The favorable melting lake is shallow enough and has plenty of food sources and cover. The female lays six to nine olive-buff-colored eggs which she incubates for 24-28 days. A larger clutch may indicate brood parasitism by other Greater Scaup or even other species of ducks.

The newly burned shells are covered underneath, and soon they are able to walk, swim, and feed themselves; However, they are not able to fly for 40-45 days after hatching. Weak little ones follow their mothers, who protect them from predators.

Greater scaup


Greater Scaup dip to take food, which they eat on the surface. They mainly eat mollusks, aquatic plants, and aquatic insects.

During the summer months, Greater Scaup will eat smaller aquatic crustaceans. Four other blasts were reported in April near Chicago that swallowed the hypnotizing leopard frog (about 5 cm (2.5 inches) in length), which they ejected into freshwater water along the road.

In the freshwater ecosystem, Greater Scaup will eat seeds, leaves, stems, and roots, as well as seeds, pondweeds, musk, and wild celery.

Because of the Greater Scaup‘s webbed legs and weight, it can sink up to 6 meters (20 feet) and remain submerged for up to a minute, allowing it to reach unknown food sources for other diving ducks.

Greater Scaups are large-sized animals, which can contain several thousand birds. When the herds are in the flowing water, they will face the stream, and when the ducks float backward, they fly to the front of the swarm to hold some position.


Common predators of the Greater Scoop are owls, skunks, raccoons, foxes, coyotes, and humans. Greater Scaups often catch themselves in fishing nets thus Greater Scaup can catch avian influenza, so future outbreaks are likely to threaten the Greater Scaup population.


The Greater Scaup has been rated as a concern species by the IUCN Redlist. When surveying the air population, larger and fewer scopes are counted together, as they look almost identical to the wind.

It was estimated that the continental scoop is about 11% larger than the population. Scoop populations have been steadily declining since the 1970s.

Some of the primary factors contributing to this decline are habitat depletion, pollutants, reproductive habitat changes, and female survival rates in the lower 25 American Scoop’s population survey of 12.2 million scoops, but the global largest scoop population survey estimates 1,200,000 to 1,400,000.

Mature Greater Scoop. There is a banding program for airborne population surveys as well as  Greater Scaup. Bands of the metal leg are placed on top of them so that if a poacher hunter dies or is caught by another banding group, the band’s number can be reported to biologists and wildlife companies. These banding programs give valuable data on migration patterns, harvest rates, and survival rates.

Greater scoop decoys, men on the left and women on the right. Each lead is linked to weight.

In Iceland, in Europe, there are large scoop species including the northern coast of the Scandinavian Peninsula, along the northern coast of the Baltic Sea, the high mountains of Scandinavia, and the proximity to the Arctic Sea in Russia.

These birds spend the wintertime in the southern islands of the British Isles, western Norway, Sweden, along the coast from Brittany to Poland, Denmark, the Alps, the eastern Adriatic Sea, the North, and West Black Sea, and the southwestern Caspian Sea.

In North America, large summers are summertime in Newfoundland and Labrador, Gulf of Ungaba, Hudson Bay, Lake Winnipeg, northern Yukon, northern Manitoba, and northern Saskatchewan.

North American shores include northern British Columbia to the south, Baja Peninsula, and Nova Scotia, and New Brunswick to Florida to the south, as well as the Great Lakes and the Gulf of Mexico.

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