Lesser Scaup (Aythya affinis)

The Lesser Scaup, scientifically known as Aythya affinis, is a small migratory diving bird that belongs to the family Anatidae. They are commonly found in North America and parts of Central America during breeding season and during winter they are seen migrating to the warmer regions of the United States, Mexico, and the Caribbean. They are known by several names such as Little Bluebill, Toil Duck and Broadbill.

The male Lesser Scaup is larger than the female and has a distinguishing black head with a green gloss, white flanks, and a bluish-grey bill. The female body has a mottled brown appearance, with a dull brown head, and a blue-grey bill with a black tip. They are predominantly waterfowl, spending most of their time in shallow water habitats such as freshwater lakes, ponds, and marshes. These birds are known for their excellent diving abilities; they can dive as deep as 18 feet to forage for food.

Lesser Scaups are omnivorous and feed on a variety of aquatic insects, snails, crustaceans, small fish and plant material. During migration, they are known to feed on rice, corn, wheat, and other grains. Their diet and behavior as diving birds make them a vital component of freshwater ecosystems.

During breeding season, Lesser Scaups form monogamous pairs and build their nests close to water edges. The female constructs the nest that is placed in dense vegetation and is lined with feathers, leaves, and other soft materials. The female lays an average of 8-10 eggs, which are incubated for about 25 days. The hatchlings are precocial and leave the nest shortly after hatching. They are capable of swimming and diving within hours of hatching.

The Lesser Scaup population has been declining over the years due to habitat loss, hunting, and pollution. Conservation efforts such as creating protected wetland areas and restricting hunting have helped to maintain their population. The Lesser Scaup is an important part of the ecosystem, and their conservation is crucial to maintaining biodiversity in their habitat.

In conclusion, the Lesser Scaup is a fascinating diving bird that plays an important role in freshwater ecosystems. Their unique abilities to dive and forage for food make them a vital part of the ecosystem. Conservation efforts should be put in place to maintain their population and ensure their long-term survival.

Other names

Aythya affinis



Lesser Scaup

morell petit



sivoleđa patka

polák vlnkovaný

Lille Bjergand

Kleine Topper


Petit Fuligule


Moretta grigia minore


mažoji žiloji antis


ogorzałka mała


Малая морская чернеть

Mala morska crnka

chochlačka vlnkovaná

Porrón bola

mindre bergand

Morbaş Patka

чернь американська


búbos réce


mazā ķerra


ameriška rjavka