Description: It is a large wading bird with a distinctive and slender appearance, characterized by a long neck, tall legs, and a slightly curved bill adapted for feeding in shallow wetlands. It measures approximately 60–70 cm (24–28 in) in length, with a wingspan that can exceed one meter. The overall plumage is dark brown to blackish-brown, heavily marked with white streaks and spots on the neck, chest, and back, giving the bird a mottled appearance. The neck often appears somewhat lighter due to the concentration of these markings. The bill is long, strong, and slightly decurved, typically yellowish or greenish in color, and especially adapted for handling hard-shelled prey. The legs are long and dark, allowing the bird to move efficiently through shallow water and marsh vegetation. The eyes are dark and the head appears elongated. In flight it shows broad, rounded wings with slow and powerful wingbeats, flying with the neck extended forward and the legs trailing behind. One of its most notable features is its loud and haunting vocalization, consisting of a series of penetrating, wailing calls that can be heard over long distances, especially at dawn, dusk, or during the night in wetland environments.

Geographic distribution: This species has a wide distribution throughout the Americas, ranging from the southeastern United States, Mexico, and Central America to much of South America. In South America it occurs from Colombia and Venezuela southward through Brazil, Paraguay, Uruguay, and northern to central Argentina. In Argentina it is most frequently found in the northeastern and central-eastern regions, particularly in areas associated with large wetland systems such as the Paraná River Delta, Iberá wetlands, and other marshlands. Although widely distributed, its presence is often localized, depending strongly on the availability of suitable wetland habitats.

Habitat: It inhabits mainly freshwater or slightly brackish wetlands, including marshes, swamps, lagoons, river edges, flooded grasslands, and rice fields. It prefers areas with dense emergent vegetation mixed with open water, where it can forage while remaining partially concealed. The species is commonly associated with soft muddy substrates, which support large populations of aquatic snails that form the basis of its diet. It may also occur in human-modified environments such as irrigation canals or flooded agricultural lands, provided that water levels and prey availability remain suitable.

Diet: Its diet is highly specialized and consists primarily of aquatic snails, particularly species of the genus Pomacea. Using its long, slightly curved bill, the bird captures the snail and skillfully extracts the soft body from the shell. This process involves manipulating the shell until the correct angle allows removal of the prey. In addition to snails, it may occasionally consume other mollusks, small crustaceans, aquatic insects, worms, and sometimes small vertebrates, although these represent a smaller portion of its diet. Foraging usually occurs while walking slowly through shallow water or muddy ground while visually scanning for prey.

Behavior: It is generally solitary or found in small scattered groups, although higher concentrations may occur in areas where food is abundant. Much of its time is spent walking slowly through wetlands in search of prey. Its movements are deliberate and calm. When threatened, it may remain still to avoid detection or fly to another nearby area of the marsh. The species is well known for its loud, far-carrying calls, which are among the most characteristic sounds of tropical and subtropical American wetlands.

Breeding: Breeding usually takes place during periods of higher water availability. The bird constructs a large nest made of sticks, reeds, and aquatic vegetation, typically placed in shrubs, low trees, or dense vegetation over water. Nests may be located low above the water or sometimes directly supported by emergent vegetation. The clutch generally consists of 2–5 eggs, pale in color with brownish markings. Both adults participate in incubation and chick care, and the young remain in the nest during the early stages of development.

Conservation status: Globally it is classified as Least Concern, largely due to its wide geographic range and relatively stable populations in many regions. Nevertheless, local populations may be affected by wetland loss, water pollution, and changes in snail availability. The protection and proper management of healthy wetland ecosystems are essential for the long-term persistence of this species.

Author of this compilation: EcoRegistros – 05/03/2026

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