Dendrocygne à bec rouge

En bref

Migratrice
  • Scientific Name: Dendrocygna autumnalis
  • Spanish Name: Pato silbón vientre negro
  • Famille : Anatidae
  • Known Nicknames: Black-bellied Tree Duck, Red-billed Whistling Duck
  • Average Length: 47–56 cm / 18.5–22 in
  • Average Weight: 680–907 g / 1.5–2.0 lb
  • Wingspan: 76–94 cm / 30–37 in
  • Key Feature: Bright red bill and legs, black belly, and white wing patch
  • Primary Diet: Primarily Herbivore (seeds, grains, aquatic plants); some invertebrates
  • Range: Southern United States (Texas, Arizona) through Central America to northern Argentina
  • Habitat: Shallow freshwater wetlands, marshes, ponds, and rice fields
  • Social Structure: Highly Social (flocks often numbering in the hundreds)
  • Nesting/Breeding: Tree cavities, nest boxes, occasionally on ground in dense vegetation
  • Statut de conservation : Préoccupation mineure (LC)
  • Évolution démographique : En hausse

The Black-bellied Whistling-Duck (*Dendrocygna autumnalis*) is a strikingly beautiful and sociable waterfowl, easily recognized by its long neck, bright pink legs, and a distinctive, high-pitched whistling call that gives it its name. Its general appearance is a study in contrast: a rich chestnut-brown head and neck, a pale gray face, and a bold white wing patch stand out against a jet-black belly and lower body. A unique feature among ducks is its long-legged, upright posture, often seen perching in trees or on fence posts rather than waddling on the ground. Special characteristics include its strong monogamous pair bonds, a preference for nesting in tree cavities, and a highly gregarious nature, often gathering in large, noisy flocks that fill wetlands with their constant, melodic whistling.

Faits amusants

Unlike most ducks, black-bellied whistling-ducks are highly arboreal, frequently perching and even nesting in trees using natural cavities or abandoned woodpecker holes. Their name comes from their distinctive, high-pitched five-note whistling call, which they often make in flight, sounding more like a bird than a typical duck’s quack. They are also known for their quirky “climbing” behavior: ducklings will use their sharp, curved claws to scramble up vertical tree trunks to reach the nest entrance, a feat made possible because both parents share equal incubation and brood-rearing duties. Remarkably, these ducks are among the few waterfowl species that are monogamous and form strong, lifelong pair bonds, and they often engage in synchronized “head-pumping” displays to reinforce their relationship.

Habitats et répartition

This species inhabits shallow freshwater wetlands, including marshes, swamps, flooded agricultural fields, ponds, and lagoons, often with abundant aquatic vegetation. It also frequents mangroves, coastal estuaries, and rice paddies, showing a strong preference for open water with nearby trees or shrubs for roosting and nesting. Its geographical range extends from the southern United States (primarily Texas, Louisiana, and Florida) through Mexico, Central America, and much of South America, reaching as far south as northern Argentina and Uruguay. It is resident year-round in most of this region, though northern populations may move slightly southward during cold weather.

Comportements & Reproduction

Black-bellied Whistling-Ducks are highly social, forming large, noisy flocks that roost and feed together year-round. They are monogamous, with pair bonds often lasting multiple seasons, and both parents share in all reproductive duties. Unlike most ducks, they do not quack; the male and female engage in synchronized whistling duets to reinforce the pair bond. They typically nest in tree cavities, including abandoned woodpecker holes or nest boxes, but will also use ground cover or even building eaves. A unique reproductive strategy is their habit of "dump nesting," where multiple females lay eggs in a single nest, leading to clutches of up to 30 eggs. Both parents then incubate the eggs for about 28 days, and the precocial ducklings are led to water within 24 hours of hatching, often jumping from considerable heights from the nest cavity.

Alimentation

The Black-bellied Whistling-Duck is primarily herbivorous, with a diet consisting mostly of seeds, grains, and aquatic plant matter, including grasses, sedges, and the seeds of water lilies and smartweeds. They are also known to supplement their diet with small invertebrates such as insects, snails, and crustaceans, particularly during the breeding season when females require extra protein for egg production. An interesting fact is that these ducks are highly adaptable foragers, often feeding at night to avoid competition and predation, and they will readily visit agricultural fields to consume spilled rice, corn, and sorghum, making them a common sight in farmlands.

Couleurs

The Black-bellied Whistling-Duck has a striking chestnut-brown head and neck, a pale gray face, and a distinctive white eye-ring. Its long, pinkish-red legs and bright orange-red bill contrast with a black belly and vent, while the back and wings are a warm chestnut with bold white wing patches visible in flight. The chest and upper back are a rich, tawny brown with fine black scalloping, and the overall pattern provides camouflage in marshy, dappled light.