Description: A large and powerful raptor recognized by its mostly black plumage, which gives it a striking appearance both in flight and when perched. It has broad wings well suited for soaring and gliding for extended periods using thermal currents. The tail is of moderate length and shows a conspicuous broad white band, particularly visible during flight and considered one of the most distinctive field marks of the species. The bill is strong, hooked, and dark, adapted for tearing prey, while the legs are relatively long and yellowish, equipped with powerful talons. The eyes are usually dark, contributing to the intense expression typical of birds of prey. Juveniles differ noticeably from adults, displaying brownish or dark plumage with pale spotting that produces a mottled pattern that gradually disappears with age. As the birds mature, their plumage becomes progressively darker and more uniform, eventually developing the characteristic appearance of adults.

Geographic distribution: This species is widely distributed from Mexico and Central America to much of South America, including Colombia, Venezuela, Ecuador, Peru, Bolivia, Paraguay, Brazil, Uruguay, and Argentina. Throughout this extensive range it mainly inhabits tropical and subtropical regions, though it also reaches temperate areas in the southern part of the continent. In Argentina it occurs primarily in northern and central provinces, particularly in association with wetland environments. In many areas it is considered resident, although local movements may occur in response to seasonal water levels or food availability. It is frequently encountered along large river systems, wetlands, and floodplains where suitable hunting conditions are present.

Habitat: It is strongly associated with aquatic or semi-aquatic habitats such as rivers, lagoons, marshes, swamps, mangroves, and riparian forests. It may also occur in seasonally flooded savannas and open landscapes near watercourses. In these environments it commonly uses tall trees, poles, or other elevated structures as perches from which it scans the surroundings for prey. Although somewhat tolerant of human-modified landscapes, the species generally requires relatively extensive natural or semi-natural habitats that support a healthy prey base. In tropical regions it occurs from lowlands up to moderate elevations and may inhabit both open woodlands and forest edges.

Feeding: The diet is varied and composed mainly of small to medium-sized vertebrates, though it may also consume other organisms opportunistically. Common prey includes fish, amphibians, reptiles—particularly snakes and lizards—small mammals, and birds. Hunting often involves waiting from an elevated perch until movement is detected, followed by a swift downward strike to capture the prey. In aquatic habitats it may also walk in shallow water or perch close to the shoreline to seize fish or amphibians. Opportunistic feeding behavior has been recorded, including the consumption of weakened animals or carrion when available. This dietary flexibility contributes to the species’ ability to exploit a variety of ecosystems.

Behavior: It is typically observed alone or in pairs, maintaining large territories within suitable habitat. Much of the day is spent alternating between vigilant perching and patrol flights over its territory. In flight it shows steady wingbeats combined with long glides, allowing efficient movement along rivers and wetlands. The species is often relatively quiet, but it can produce loud, harsh calls, particularly during the breeding season or territorial interactions. In many regions it is commonly seen perched in trees near water, from where it carefully watches the ground or water surface for potential prey.

Nesting: Breeding generally occurs during the dry season or at the beginning of the rainy season depending on the region. The species builds a large stick nest placed high in the canopy of tall trees, often near bodies of water. The nest interior may be lined with fresh green leaves or other plant materials. The clutch usually consists of one or two pale eggs marked with brownish spots. Both adults participate in territory defense and parental care, although incubation is mainly carried out by the female. The chicks remain in the nest for several weeks while being fed by the adults. After fledging, the young birds may continue to depend on their parents for some time while developing their flying and hunting skills.

Conservation status: Globally the species is classified as Least Concern (LC) by the International Union for Conservation of Nature (IUCN). Its broad geographic range and ecological adaptability contribute to generally stable populations across much of its distribution. Nevertheless, local populations may be affected by wetland degradation, deforestation, and water pollution, which can reduce both prey availability and nesting sites. The protection of aquatic ecosystems and riparian forests is essential for maintaining healthy populations of this raptor and other species associated with wetland environments.

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