<trp-post-container data-trp-post-id='360395'>Plumbeous Rail

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En bref

  • Scientific Name: Pardirallus sanguinolentus
  • Spanish Name: Rascón plomizo
  • Family: Rallidae
  • Known Nicknames: Plumbeous Rail, Slaty Rail
  • Longueur moyenne : 30 à 35 cm / 12 à 14 pouces
  • Average Weight: 200–300 g / 7–10.6 oz
  • Envergure : N/A
  • Key Feature: Uniform slate-gray plumage with a reddish iris and a long, slightly decurved greenish bill with a red base
  • Régime alimentaire principal : Omnivore
  • Range: Southeastern Brazil, Uruguay, Paraguay, eastern Argentina, and southern Chile
  • Habitat: Freshwater marshes, swamps, and wet grasslands with dense vegetation
  • Structure sociale : Solitaires ou en couples
  • Nesting/Breeding: Ground nest hidden in dense marsh vegetation
  • Statut de conservation : Préoccupation mineure (LC)
  • Évolution démographique : Stable

The Plumbeous Rail (*Pardirallus sanguinolentus*) is a secretive, medium-sized waterbird found in marshes and wetlands across South America, from Peru to central Argentina. Its name derives from its striking, uniform slate-gray plumage, which is accented by a vivid red-orange bill and legs, creating a stark contrast against its dark body. A special feature of this rail is its blood-red eye, which lends the species its Latin name *sanguinolentus* ("bloody"), and its long, slightly curved toes that allow it to walk deftly over floating vegetation. Despite its bold coloration, it is far more often heard than seen, emitting a series of sharp, metallic *kek-kek-kek* calls at dawn and dusk. This rail is also notable for its unusual habit of swimming in open water to escape predators, using its wings for propulsion, a behavior rare among its mostly skulking relatives.

Faits amusants

The Plumbeous Rail’s scientific name *sanguinolentus* means “blood-stained,” referencing the vivid red patch at the base of its bill that looks like a fresh wound. Unlike most rails, it is surprisingly bold and will charge at humans who approach its nest, hissing like a cat and fanning its tail feathers to appear larger. It also has a peculiar habit of “sunbathing” with its wings spread wide on muddy banks, possibly to bake off parasites or warm its dark plumage after foraging in cold water. Despite being a strong flier, it prefers to run through dense marsh vegetation, using its long toes to walk on floating lily pads without sinking.

Habitats et répartition

The Plumbeous Rail is found in a variety of freshwater wetlands across southern South America. Its habitat includes marshes, swamps, flooded grasslands, ponds, and the margins of slow-moving rivers and lakes, where dense vegetation like reeds, sedges, and rushes provides cover for foraging and nesting. It also occurs in rice paddies and other agricultural wetlands. The species has a broad geographical range extending from extreme southeastern Brazil and Uruguay through Paraguay, central and southern Chile, and most of Argentina, including the lowland pampas and Patagonian steppe. Its distribution reaches south to Tierra del Fuego and the Falkland Islands, with some populations migrating northward during the austral winter to avoid freezing conditions.

Comportements & Reproduction

The Plumbeous Rail is generally monogamous, with pairs forming strong bonds that often persist across multiple breeding seasons. Its social structure is primarily solitary or in pairs, defending small territories in marshy or aquatic habitats. Mating involves elaborate courtship displays, including mutual preening, head-bobbing, and coordinated duets that reinforce the pair bond. A unique reproductive strategy is its reliance on concealed, floating nests built among dense reeds or sedges, often constructed by both parents. Clutches typically consist of 3 to 5 eggs, and both adults share incubation duties for about 18 to 20 days. The precocial chicks are able to leave the nest shortly after hatching, with both parents actively brooding and guiding them through the vegetation to forage, though they remain dependent for several weeks. There is no evidence of cooperative breeding or extra-pair copulations in this species.

Alimentation

The Plumbeous Rail is an omnivorous bird with a diet centered on aquatic and semi-aquatic invertebrates, which it forages for by probing soft mud and shallow water with its long bill. Its primary prey includes insects such as beetles, dragonfly larvae, and grasshoppers, as well as spiders, snails, small crustaceans, and earthworms. It also consumes small vertebrates like tadpoles and tiny fish when available. Interestingly, this rail exhibits a notable shift toward plant matter during the non-breeding season, readily eating seeds, aquatic plant roots, and tender shoots, demonstrating dietary flexibility. Another fascinating aspect is its foraging strategy: it often feeds in pairs or small family groups, using a "head-bobbing" motion to visually locate prey before swiftly striking, and it will occasionally flip over stones or floating debris to uncover hidden food items.

Couleurs

The Plumbeous Rail has a uniform slate-gray head, neck, and underparts, contrasting with a brownish-olive back and wings marked by subtle dark streaking. Its most distinctive feature is a bright red bill with a yellow tip, complemented by red legs and eyes. This muted, mottled plumage provides effective camouflage in its marshy, reedy habitat.

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