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ruddy duck

Oxyura jamaicensis

What do they look like?

Ruddy duck males and females are different in appearance, and males change appearance depending on the time of year. During the summer male ruddy ducks have rich chestnut necks and bodies. The crown, nape, and tail, which are held erect or horizontal to the water, are dark brown. Males have pure white faces. Females have a dark line across the face. Females and young ruddy ducks have barred bodies that lack any chestnut color. During the winter, male ruddy ducks resemble females except for their white face. Ruddy ducks have large, flat pale blue bills. Males tend to be larger than females in weight and wingspan.

In the summer male ruddy ducks look similar to females. In the winter male ruddy ducks have their breeding plumage, with rich, chestnut colored feathers. During this time their bill becomes bright blue as well.

  • Sexual Dimorphism
  • male larger
  • sexes colored or patterned differently
  • Range mass
    310 to 795 g
    10.93 to 28.02 oz
  • Range length
    35 to 43 cm
    13.78 to 16.93 in
  • Range wingspan
    135 to 154 mm
    5.31 to 6.06 in

Where do they live?

Ruddy ducks are native to North and South America. These stiff-tailed ducks nest in western and central Canada as far east as the Great Lakes region and south to central Texas and southern Mexico. In the winter they are found throughout most of southern North America and central America, from California through the Great Lakes region to the Atlantic coast. Ruddy ducks were introduced to England in 1960 in Gloucestershire.

What kind of habitat do they need?

Ruddy ducks inhabit permanent freshwater marshes, lakes, and ponds during their breeding season. These pools contain a considerable amount of vegetation in which these ducks hide their nests. During the winter ruddy ducks prefer shallow marshes and coastal bays.

How do they reproduce?

Ruddy ducks breed seasonally. They migrate to breeding grounds in late winter. When they get to their breeding areas males begin to perform courtship displays. A male swims around a female with his tail tilted forward and neck outstretched. He then slaps his chestnut-colored chest with his bright blue bill while making a courtship call. The male also uses his tail to stand and scoot across the surface of the water. When the female is satisfied with this performance, she stretches her neck with her bill open.

Ruddy ducks breed in spring and summer months, from May to August. When they arrive on the breeding grounds, females construct nests of aquatic plants just above the water level. They often build a dome over the nest to hide it from predators. About 4 weeks after arriving at the breeding grounds, females are ready to nest. Sometimes, though, females are ready to lay eggs before they have finished their own nests and they may simply lay eggs in unprotected areas that hatch after 23 to 26 days. Young ruddy ducks are well developed when they hatch. They stay in the nest 1 day after hatching and then are led away from the nest and into the water. At this point young ruddy ducks can dive to find food and can defend themselves. Parents abandon their young 20 to 30 days after hatching, but it takes another 20 to 35 days after that for the young ruddy ducks to learn how to fly.

  • How often does reproduction occur?
    Ruddy ducks breed once yearly.
  • Breeding season
    Breeding is from May to August.
  • Range eggs per season
    6 to 10
  • Average eggs per season
    8
    AnAge
  • Range time to hatching
    23 to 26 days
  • Range fledging age
    50 to 55 days
  • Range time to independence
    20 to 30 days
  • Average age at sexual or reproductive maturity (female)
    1 years
  • Average age at sexual or reproductive maturity (male)
    1 years

Female ruddy ducks construct and cover nests for their young, invest energy in making the eggs, and do all of the incubation of eggs. They also aggressively protect their young for several weeks after they hatch. Male ruddy ducks don't care for their young. They may remain near the female during incubation and after the young hatch, but they don't make any effort to protect or feed them.

  • Parental Investment
  • precocial
  • pre-fertilization
    • provisioning
    • protecting
      • female
  • pre-hatching/birth
    • provisioning
      • female
    • protecting
      • female
  • pre-weaning/fledging
    • provisioning
      • female
    • protecting
      • female

How long do they live?

Althugh most ruddy ducks die when they are young, if they survive to adulthood they can live up to 13 years in the wild in their native range.

  • Range lifespan
    Status: wild
    13 (high) years
  • Average lifespan
    Status: captivity
    2.4 years
  • Average lifespan
    Status: wild
    163 months
    Bird Banding Laboratory

How do they behave?

Ruddy ducks are clumsy on land, their legs are set far back on the body, making it difficult for them to walk. The same placement of their legs makes them exceptionally fast and agile in the water. They can dive or sink into the water with little effort. While diving, the feet paddle simultaneously and wings remain closed. To take flight these ducks must beat their wings rapidly and run along the surface of the water. Ruddy ducks fly just above the water, even during migration when they travel in medium to large sized flocks at night to their summer breeding grounds.

These ducks are usually found alone, in pairs, or in small groups of eight to twelve. They generally don't flock with other kinds of ducks or geese.

Home Range

Ruddy ducks do not actively defend a territory, nor do they restrict themselves to a given home range for any part of the year.

How do they communicate with each other?

Ruddy ducks usually don't make many calls or other sounds. During courtship, males perform an elaborate display accompanied by a call in order to attract a mate. Their calls sound like: chuck-chuck-chuck-chuck-chur-r-r; and ip-ip-ip-ip-u-cluck; and tick, tick, tick, tickety, quo-ack; as well as chica, chica, chica, chica, quak.

What do they eat?

Ruddy ducks are omnivorous. Their diet consists mainly of aquatic invertebrates and plants. Their wide bill is used to grab food when they dive and then sort out parts they want to eat. They mostly eat plant seeds, leaves of aquatic plants, crustaceans, and midge larvae and pupae.

  • Animal Foods
  • insects
  • mollusks
  • aquatic or marine worms
  • aquatic crustaceans
  • Plant Foods
  • leaves
  • seeds, grains, and nuts

What eats them and how do they avoid being eaten?

Ruddy ducks have the ability to sink below the surface of the water to escape predators. During breeding season they make nests using vegetation, which camouflages nests and makes them more difficult for nest predators to find. Females and nestlings have drab feathers that help them blend in with their surroundings as well.

Eggs and nestlings are taken by predators such as racoons, mink, American crows, black-crowned night herons, ring-billed gulls, and California gulls. Adults are preyed on by red-tailed hawks, great horned owls, red foxes, mink, and possibly Swainson's hawks. Ruddy ducks are also legally hunted in North America and Europe.

  • These animal colors help protect them
  • cryptic

What roles do they have in the ecosystem?

In the ecosystems in which they live, ruddy ducks act as predators on soft-bodied invertebrates such as midge larvae and crustaceans. They also eat aquatic vegetation. Ruddy ducks are preyed on by many organisms, including raccoons, mink, American crows, red-tailed hawks, and great horned owls. Ruddy ducks are used as a host by parasites that reside in their intestinal tracts.

Since their introduction to Europe in the 1960s, ruddy ducks have also impacted ecosystems by threatening native white-headed ducks (Oxyura leucocephala).

Commensal or parasitic species (or larger taxonomic groups) that use this species as a host
  • Polymorphus obtusus
  • Corynosoma constrictum
  • Hymenolepis cyrtoides
  • Diorchis excentrica

Do they cause problems?

Ruddy ducks do not harm people.

How do they interact with us?

In the past, ruddy ducks were hunted for the quality of their meat. There continues to be regulated sport hunting in the United States and Europe. (Gooders and Boyer, 1986)

  • Ways that people benefit from these animals:
  • food

Are they endangered?

Ruddy duck populations are considered stable throughout their range, and are considered a species of "Least Concern" on the IUCN list.

Contributors

Tanya Dewey (editor), Animal Diversity Web.

Lana Hall (author), Radford University, Karen Francl (editor, instructor), Radford University.

Glossary

Nearctic

living in the Nearctic biogeographic province, the northern part of the New World. This includes Greenland, the Canadian Arctic islands, and all of the North American as far south as the highlands of central Mexico.

World Map

Neotropical

living in the southern part of the New World. In other words, Central and South America.

World Map

Palearctic

living in the northern part of the Old World. In otherwords, Europe and Asia and northern Africa.

World Map

acoustic

uses sound to communicate

bilateral symmetry

having body symmetry such that the animal can be divided in one plane into two mirror-image halves. Animals with bilateral symmetry have dorsal and ventral sides, as well as anterior and posterior ends.

brackish water

areas with salty water, usually in coastal marshes and estuaries.

chemical

uses smells or other chemicals to communicate

coastal

the nearshore aquatic habitats near a coast, or shoreline.

cryptic

having markings, coloration, shapes, or other features that cause an animal to be camouflaged in its natural environment; being difficult to see or otherwise detect.

diurnal
  1. active during the day, 2. lasting for one day.
endothermic

animals that generate their own body heat through metabolic processes.

estuarine

an area where a freshwater river meets the ocean and the fresh and saltwater mixes

food

A substance that provides both nutrients and energy to a living thing.

freshwater

mainly lives in water that is not salty.

introduced

referring to animal species that have been transported to and established populations in regions outside of their natural range, usually through human action.

iteroparous

offspring are produced in more than one group (litters, clutches, etc.) and across multiple seasons (or other periods hospitable to reproduction). Iteroparous animals must, by definition, survive over multiple seasons (or periodic condition changes).

marsh

marshes are wetland areas often dominated by grasses and reeds.

migratory

makes seasonal movements between breeding and wintering grounds

monogamous

Having one mate at a time.

motile

having the capacity to move from one place to another.

natatorial

specialized for swimming

native range

the area in which the animal is naturally found, the region in which it is endemic.

omnivore

an animal that mainly eats all kinds of things, including plants and animals

oviparous

reproduction in which eggs are released by the female; development of offspring occurs outside the mother's body.

polygynous

having more than one female as a mate at one time

saltwater or marine

mainly lives in oceans, seas, or other bodies of salt water.

seasonal breeding

breeding is confined to a particular season

sexual

reproduction that includes combining the genetic contribution of two individuals, a male and a female

social

associates with others of its species; forms social groups.

solitary

lives alone

tactile

uses touch to communicate

temperate

that region of the Earth between 23.5 degrees North and 60 degrees North (between the Tropic of Cancer and the Arctic Circle) and between 23.5 degrees South and 60 degrees South (between the Tropic of Capricorn and the Antarctic Circle).

visual

uses sight to communicate

young precocial

young are relatively well-developed when born

References

Brua, R. 1999. Ruddy Duck Nesting Success: Do Nest Characteristics Deter Nest Predation?. The Condor, 101/4: 867-870. Accessed October 19, 2007 at http://links.jstor.org/sici?sici=0010-5422%28199911%29101%3A4%3C867%3ARDNSDN%3E2.0.CO%3B2-R.

Cleave, H., W. Starrett. 1940. The Acanthocephala of Wild Ducks in Central Illinois, with Descriptions of Two New Species. Transactions of the American Microscopical Society, 59/3: 348-353.

Gooders, J., T. Boyer. 1986. Ducks of North America and the Northern Hemisphere. New York: Facts On File, Inc..

Hohman, W., C. Ankney, D. Roster. 1992. Body Condition, Food Habits, and Molt Status of Late-Wintering Ruddy Ducks in California. The Southwestern Naturalist, 37(3): 268-273.

Hughes, B. 2006. "Global Invasive Species Database" (On-line). Accessed November 09, 2007 at http://www.invasivespecies.net/database/species/ecology.asp?si=152&fr=1&sts=.

Jehl, J., E. Johnson. 2004. Wing and Tail Molts of the Ruddy Duck. Waterbirds, 27(1): 54-59.

Joyner, D. 1977. Behavior of Ruddy Duck Broods in Utah. The Auk, 94: 343-349.

Korschgen, C., L. George, W. Green. 1985. Disturbance of Diving Ducks by Boaters on a Migrational Staging Area. Wildlife Society Bulletin, 13(3): 290-296.

Kortright, F. 1967. The Ducks, Geese, and Swans of North American. Harrisburg, Pennsylvania: The Stackpole Company.

Matthias, D. 1963. Helminths of Some Waterfowl from Western Nevada and Northeastern California. The Journal of Parasitology, 49/1: 155.

Munoz-Fuentes, V., A. Green, M. Sorenson, J. Negro. 2006. The ruddy duck Oxyura jamaicensis in Europe: natural colonization or human introduction?. Molecular Ecology, 15: 1441-1453.

Pough, R. 1951. All the Birds of Eastern and Central North America. Garden City, New York: Doubleday & Company Inc..

Priebe, M. 1952. Acanthocephalan Parasites of Waterbirds in Eastern Washington. Transactions of the American Microscopical Society, 71/4: 347-349.

Sanchez, M., A. Green, J. Dolz. 2000. The diets of the White-headed Duck Oxyura leucocephala, Ruddy Duck O. jamaicensis and their hybrids from Spain. Bird Study, 47: 275-284.

Siegfried, W. 1976. Breeding Biology and Parasitism in the Ruddy Duck. The Wilson Bulletin, 88(4): 566-574.

Siegfried, W. 1976. Social Organization in Ruddy and Maccoa Ducks. Auk, 93: 560-570.

Tome, M. 1991. Diunral Activity Budget of Female Ruddy Duck Breeding in Manitoba. Wilson Bulletin, 103(2): 183-189.

Tome, M., D. Wrubleski. 1988. Underwater Foraging Behavior of Canvasbacks, Lesser Scaups, and Ruddy Ducks. The Condor, 90(1): 168-172.

 
University of Michigan Museum of ZoologyNational Science Foundation

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Hall, L. 2008. "Oxyura jamaicensis" (On-line), Animal Diversity Web. Accessed April 23, 2014 at http://www.biokids.umich.edu/accounts/Oxyura_jamaicensis/

BioKIDS is sponsored in part by the Interagency Education Research Initiative. It is a partnership of the University of Michigan School of Education, University of Michigan Museum of Zoology, and the Detroit Public Schools. This material is based upon work supported by the National Science Foundation under Grant DRL-0628151.
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