Long-winged Harrier

Possesses a slender and highly elegant silhouette, characteristic of raptors adapted to open landscapes, marked by exceptionally long, narrow wings and a long, narrow tail. This medium-sized bird of prey measures approximately 19 to 24 inches (48 to 60 centimeters) in length, with a wingspan ranging from 45 to 55 inches (115 to 140 centimeters), and exhibits pronounced sexual size dimorphism, where females are notably larger and heavier than males. This species is highly polymorphic, presenting two distinct color morphs. The pale morph displays dark gray to blackish upperparts, a conspicuous black breast band, and starkly contrasting white underparts. Conversely, the dark morph features a nearly uniform sooty-black plumage, with the exception of silver-gray and charcoal-barred flight feathers and tail. In both color phases, the eyes are a piercing yellow, the hooked bill is dark with a bright yellow cere, and the long, unfeathered legs are a vibrant yellow, ideal for grasping prey deep within dense vegetation. A well-defined facial disc, similar to that of owls, encircles the eyes and helps funnel acoustic cues to its ears.

Geographical distribution: Occurs extensively throughout the South American continent. Its vast range extends from the northern reaches of Colombia, Venezuela, Guyana, Suriname, French Guiana, and Trinidad, southward through large expanses of Brazil, Paraguay, and Uruguay, reaching down into central and southern Argentina (and occasionally as a vagrant in Tierra Fuera). It is also documented as an occasional visitor in eastern Chile and the Falkland Islands. Populations breeding in the cooler, southern latitudes of Patagonia and the Pampas undergo regular northward migrations during the austral winter to escape freezing temperatures and dwindling food resources.

Habitat: Is strongly associated with open, predominantly wet ecosystems. It selectively occupies flooded grasslands, freshwater marshes, peatlands, reed beds, wet savannas, and agricultural fields such as rice paddies. It strictly avoids dense forests, closed woodlands, and mountainous terrains, preferring low-altitude plains that allow for unhindered low-altitude flight. The presence of tall, dense herbaceous vegetation is a vital habitat component, providing both nesting cover and a high density of prey species.

Feeding: Functions as a highly versatile and opportunistic carnivorous predator. Its diet is remarkably diverse, consisting of small mammals such as wild rodents, small lizards, amphibians, ground-nesting passerines, waterfowl chicks, and large insects. It hunts by gliding low over the vegetation, utilizing its exceptional visual acuity and directional hearing—the latter enhanced by its specialized facial disc—to detect hidden movement. Once prey is located, it performs a sudden, controlled drop, seizing the target with its long, sharp talons.

Behavior: Is renowned for its specialized low-altitude quartering flight. It glides effortlessly mere feet above the ground, holding its wings in a distinct shallow "V" shape (dihedral flight), rocking gently from side to side with deliberate, elastic wingbeats. It is primarily a solitary species, though loose aggregations may form at rich feeding sites or along migratory routes. It is fiercely territorial during the breeding season, defending its nesting area from other raptors and intruders through aggressive aerial displays, dives, and sharp vocalizations.

Nesting: Commences its breeding cycle in response to seasonal rainfall patterns, which determine water levels and prey abundance in wetland habitats. The nest is a flat, circular platform constructed from rushes, reeds, and dry grasses, built directly on the ground or concealed within thick marsh vegetation, sometimes even floating on shallow water. A clutch typically consists of three to four dull white eggs, which may occasionally feature light brown speckling. Incubation is performed almost exclusively by the female for approximately 30 days, during which time the male hunts and delivers prey to the nest site.

Conservation status: Is currently categorized as Least Concern (LC) on the IUCN Red List of Threatened Species. While its overall geographical range is immense, local populations face severe pressure from the destruction of wetlands, the conversion of native grasslands into intensive agricultural monocultures, and the widespread use of pesticides, which reduces food availability and leads to the bioaccumulation of toxic chemicals.