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North American Ruddy Duck by Lisa G. Putman

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“Its intimate habits, its stupidity, its curious nesting customs and ludicrous courtship performance place it in a niche by itself. Even its eggs are unique in appearance and are deposited in a slip-shod, irregular manner that is most extraordinary. Everything about this bird is interesting to the naturalist, but almost nothing about it is interesting to the sportsman." J. C. Phillips, A Natural History of Ducks, 1926: 164

This small-bodied, stiff-tailed duck is still disdained by most hunters and ranks as a pest species in Europe, where it has been introduced. Birders appreciate it, however, because adult males are richly colored with a striking, bright, sky-blue bill and have a highly entertaining courtship display. Indeed, compared with other North American ducks, the Ruddy Duck is unusual in almost every aspect of its biology.

Unlike most waterfowl, pairs form on the breeding grounds. Males perform unique, comical courtship displays and establish seasonally monogamous pair bonds, but some males are polygynous. Females lay large, rough, white eggs in well-concealed nests over water; their eggs are the largest relative to body size of all waterfowl, with a correspondingly high energetic cost of egg production. Highly precocial ducklings are tended by the female only and for a shorter period of time than most ducks. Some non-paternal males are known to accompany the brood but provide no care. Unusual among waterfowl, except other stiff-tailed ducks, a small percentage of Ruddy Ducks apparently undergo 2 remigial molts per year.

Ruddy Duck populations are stable or increasing throughout most of the North American breeding range. This species breeds primarily in the prairie pothole region of North America and is a common winter resident of brackish to saline coastal habitats and large inland water bodies. Adults and ducklings are mostly carnivorous and feed extensively on midge larvae (Diptera: Chironomidae), almost to the point of being a specialist on these insects.

Most research on this species has concentrated on 1 or more of its unusual aspects. Substantive information is available from southwest Manitoba on bioenergetics of egg formation (Alisauskas and Ankney 1994a, 1994b) and nesting ecology (Brua 1999). Studies of foraging behavior in captives are excellent (Tome 1988, 1989b; Tome and Wrubleski 1988). Studies of nest parasitism in Utah also provide valuable information (Joyner 1976, 1983). Due to their unique habits and interest to birders, stiff-tails have been covered in an excellent compilation by Johnsgard and Carbonell (1996). Future studies on adult survival, mating-system genetics, dispersal, and wintering ecology would be helpful.

The North American Ruddy Duck is a member of the tribe of “stiff-tailed ducks,” Most duck species have one or two characteristics that make them different. But with ruddy ducks, almost everything is unusual. Ruddies can be recognized by their small size and spiky tail feathers, which they often hold erect above the water. Ruddy ducks are shy, spending much of their time surrounded by the cattails that grow in shallow water at the edge of wetlands. A ruddy duck hen has the remarkable ability to lay a clutch of eggs, at the rate of one per day, that can exceed her own body mass!


  • Brenda Burnett
    Brenda Burnettover 4 years ago

    Wow, a beautiful duck. Never saw one like this before. Great photo. Lovely job. Brenda

  • Kimberly Chadwick
    Kimberly Chadwickover 4 years ago

    Awesomely done. Those bills are so hard for me to capture at almost any light! Great capture Lisa!

  • Thank you, Kimberly, I know what you mean. I have about 25 or more photos in which the bill looks bleached out or white, compared to what it looks like in real life. When I’ve tried adjusting levels, it darkens the eyes and cinnamon colored feathers. I finally got it right…just wished I’d been closer and he has his tail feathers raised….LOL…I don’t ask much of my wildlife subjects…LOL…

    – Lisa G. Putman

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