Fulvous Whistling Duck
Dendrocygna bicolor
Quick Facts
- Scientific Name: Dendrocygna bicolor
- Spanish Name: Suirirí bicolor
- Family: Anatidae
- Known Nicknames: Fulvous Tree Duck, Large Whistling Duck
- Average Length: 45–53 cm / 18–21 in
- Average Weight: 712–1,050 g / 1.6–2.3 lb
- Wingspan: 85–93 cm / 33–37 in
- Key Feature: Uniform cinnamon-buff plumage with a long neck, long legs, and a distinctive creamy-white stripe on the flanks
- Primary Diet: Herbivore (primarily seeds, aquatic plants, and grains)
- Range: Southern United States, Mexico, South America, Sub-Saharan Africa, and the Indian Subcontinent
- Habitat: Shallow freshwater wetlands, flooded grasslands, and rice fields
- Social Structure: Highly Social (gregarious, often found in large, noisy flocks)
- Nesting/Breeding: Nests on the ground in dense vegetation or occasionally in tree hollows
- Statut de conservation : Préoccupation mineure (LC)
- Population Trend: Stable
The Fulvous Whistling Duck (*Dendrocygna bicolor*) is a striking, long-legged waterfowl known for its rich, cinnamon-colored plumage and an elegantly elongated silhouette that bridges the gap between a duck and a goose. This pantropical species is most famous for its namesake vocalization—a clear, two-note whistle that replaces the traditional quack—and its remarkably social nature, often congregating in large, noisy flocks within shallow wetlands and rice fields. Its physical appearance is highlighted by creamy-white stripes along its flanks, a dark bill, and a prominent white crescent on its rump that is visible during its graceful, slow-flapping flight. Uniquely, these ducks are monomorphic, meaning males and females are nearly identical in their handsome tawny coats, and they are primarily nocturnal foragers, spending their nights wading through water to feed on seeds and aquatic plants.
Faits amusants
True to their name, these birds emit a high-pitched, two-note whistle rather than a traditional quack. They are notorious "brood parasites," frequently laying their eggs in the nests of other ducks to let them handle the parenting duties. While many waterfowl are active by day, these ducks are primarily nocturnal foragers, spending their nights diving for seeds and aquatic plants. Their exceptionally long legs and necks give them a distinct, goose-like silhouette, and they hold the rare distinction of being naturally resident across four different continents—the Americas, Africa, and Asia—despite not being a typical long-distance migratory species.
Habitats et répartition
This species primarily inhabits shallow freshwater wetlands, including marshes, swamps, and flooded grasslands. It shows a strong preference for areas with dense emergent vegetation, which provides both cover and foraging opportunities. In many regions, it has adapted well to human-altered landscapes, frequently occupying rice paddies and irrigation ditches where it feeds on seeds and aquatic plants. Its geographical range is remarkably broad and disjunct, spanning four continents. It is found throughout much of tropical and subtropical America, from the southern United States and Mexico down through parts of the Caribbean and South America. Additionally, populations thrive across large portions of Sub-Saharan Africa and the Indian subcontinent. Despite these vast distances between populations, the species shows very little regional variation.
Comportements & Reproduction
These ducks are highly social and non-territorial, typically congregating in large, noisy flocks that are most active during the twilight hours or at night. They form strong, long-term monogamous pair bonds that often persist across multiple breeding seasons. During courtship, pairs engage in synchronized displays, including a "triumph ceremony" where they face each other and tread water while calling loudly to reinforce their bond. Breeding usually coincides with local water levels and food availability. Nests are typically constructed from woven vegetation in tall grasses or shallow marshes, though they occasionally utilize tree cavities. A notable reproductive strategy is their tendency toward brood parasitism, frequently laying eggs in the nests of other individuals or even different duck species. Unusually for waterfowl, both the male and female share the responsibilities of incubating the eggs and protecting the ducklings after they hatch.
Alimentation
The Fulvous Whistling Duck is primarily a herbivorous forager that specializes in consuming the seeds, stems, and shoots of various aquatic plants, grasses, and sedges. These ducks are notably nocturnal feeders, often flying to flooded fields or shallow wetlands under the cover of darkness to search for food. A significant portion of their diet consists of agricultural grains, particularly rice, which frequently draws large flocks to commercial rice paddies where they are sometimes viewed as a nuisance. While they primarily consume vegetable matter, they occasionally supplement their nutritional intake with small aquatic invertebrates such as mollusks and insects. Interestingly, they employ a variety of feeding techniques including dabbling on the water's surface, upending their bodies to reach submerged vegetation, and even diving in deeper water, utilizing their relatively long necks to forage efficiently in the muddy substrate of their wetland habitats.
Couleurs
The Fulvous Whistling Duck features a uniform cinnamon-buff or tawny body with a darker, scaly-patterned back edged in rufous. Distinctive creamy-white plumes create a bold stripe along its flanks, while a white crescent marks the rump and fine white flecking forms a pale collar on the neck. Its long legs and bill are a contrasting blue-grey, providing warm-toned camouflage that blends seamlessly into tall marsh grasses and wetland vegetation.
