Species Profile
Ruddy Duck
Oxyura jamaicensis
Ruddy Duck
Quick Facts
Conservation
LCLeast ConcernAlso known as: Stiff-tailed Duck, Spiny-tailed Duck
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Appearance
The Ruddy Duck is a compact, stiff-tailed diving duck with a distinctive profile.
Males in breeding plumage have a rich chestnut body, black cap, bright white cheeks, and a striking blue bill. Their fan-shaped tail is often held upright when swimming. Outside of the breeding season, males have much duller gray-brown plumage and a dark gray bill.
Females and non-breeding males are more subdued, with mottled brown plumage and a dark crown stripe. Both sexes have small, concave wings, thick, short necks and enormous webbed feed that is rarely seen out of the water. Juveniles resemble females but with less distinct markings.
Identification & Characteristics
Male Colors
- Primary
- Brown
- Secondary
- Rufous
- Beak
- Blue
- Legs
- Grey
Female Colors
- Primary
- Brown
- Secondary
- Black
- Beak
- Grey
- Legs
- Grey
Female Markings
Mottled brown plumage with dark crown and cheek stripe
Attributes
Understanding Attributes
Rated 0–100 based on research and observation. A score of 50 is average across all bird species. These attributes are relative and don't necessarily indicate superiority.
Habitat & Distribution
Ruddy Ducks inhabit freshwater marshes, ponds, and lakes with abundant emergent vegetation. They breed across western North America, from Alaska to Mexico, and have been introduced to Europe. In winter, they're found in coastal estuaries and large inland water bodies.
In the United States, they're common in the western states and along the Atlantic coast. The largest concentrations occur during the breeding season in South and North Dakota, Southwestern Manitoba, and neighboring states and provinces on either side of the USA/Canada border.
Ruddy Ducks are a controversial bird in the United Kingdom. They are very rare in the wild after a largely successful eradication program that began in 2005, and birdwatchers are encouraged to report sightings. They're also found in parts of mainland Europe and occasionally in New Zealand.
Distribution
Where to See This Bird
Explore regional guides for locations where this bird has been recorded.
Diet
Ruddy Ducks primarily feed on aquatic invertebrates, especially midge larvae, which they obtain by diving and straining mud through their specialized bill.
They also consume small crustaceans, mollusks, and some aquatic plants. Their diet varies seasonally, with more plant matter eaten during winter.
Behaviour
Ruddy Ducks are excellent divers, often submerging for up to 30 seconds while foraging. They rarely walk on land and prefer to spend most of their time on water.
During courtship, males perform an elaborate display, slapping their bill against their chest to create bubbles while making a soft drumming sound.
Calls & Sounds
Ruddy Ducks are generally quiet, but males produce a distinctive sound during courtship. This vocalization is a low, burping 'bub-bub-bubber-bub' often accompanied by bill-slapping on their chest.
Females make a softer, squeaking call, particularly when disturbed or communicating with ducklings.
Nesting & Breeding
Ruddy Ducks form pairs in late spring, with breeding occurring from May to August. Males perform elaborate courtship displays, including bill-slapping and bubbling behaviors to attract females.
Females construct nests over water in dense vegetation, using surrounding plants and their own down. They typically lay 6-10 creamy white eggs, which are notably large for the bird's size.
Incubation lasts about 23-26 days and is carried out solely by the female. Ducklings are precocial and able to swim and dive shortly after hatching, but they remain with the female for several weeks before becoming independent.
Conservation
While globally listed as Least Concern, Ruddy Ducks face challenges in Europe where they're considered an invasive species.
Control programs in the UK and other European countries aim to protect the native White-headed Duck from hybridization. In North America, wetland conservation efforts benefit this species.
Birdwatching Tips
- Look for their distinctive stiff, upright tail while swimming
- Observe their diving behavior, as they frequently submerge for food
- Listen for the male's unique bubbling display during breeding season
- In the UK, check reservoirs and gravel pits where they've become established
Did You Know?
- Ruddy Ducks have the highest wing-loading of any duck, making them excellent divers but poor fliers.
- Their stiff tail feathers are used as a rudder underwater and as a prop when standing.
- The blue bill of breeding males is not feathered but consists of enlarged, modified skin.
- Ruddy Ducks are not native to the United Kingdom. They escaped captivity in the 1950s and quickly established themselves, eventually crossing to continental Europe and spreading to more than 20 other countries.
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