Nanday Parakeet

Characterized by its slender silhouette, this medium-sized parrot measures approximately 30 to 37 centimeters in length and weighs around 140 grams. Its plumage is predominantly a vibrant bright green, transitioning to a lighter, more yellowish-green tone on the underparts. The most striking diagnostic feature is its prominent jet-black facial mask or hood, which covers the forehead, crown, lores, and cheeks, sharply contrasting with the rest of its head. The robust, hooked bill is colored dark grey to black. Across the upper breast, it features a subtle yet elegant light blue or turquoise collar, while the primary and secondary flight feathers display a brilliant cobalt blue coloration. Another highly distinctive physical trait is its thighs, which are adorned with feathers of a vivid bright red color, often referred to as "red stockings." The long, pointed tail is olive-green on the upper side with a blue tip, and dull grey on the underside. The bare orbital ring is whitish or pale grey, and the iris is olive-brown. The species exhibits no sexual dimorphism, meaning males and females are visually identical.

Geographical distribution: Native to the central regions of South America, this bird is widely distributed across the wetlands and savannas of the Paraguay River basin. Its natural range encompasses southeastern Bolivia (Santa Cruz department), southwestern Brazil (Mato Grosso and Mato Grosso do Sul states), the entirety of Paraguay, and northern Argentina (provinces of Formosa, Chaco, Santa Fe, and Corrientes). Due to the international pet trade and accidental escapes, it has established highly successful, self-sustaining feral breeding populations in several regions far from its native range, including urban and suburban areas of the United States (especially in California, Florida, and Texas) as well as some parts of Europe.

Habitat: Primarily inhabits open and semi-open lowland biomes where water is highly accessible. It is a signature species of the Gran Chaco and the Pantanal regions. Its preferred environments include humid savannas, grasslands interspersed with palm groves—particularly those dominated by the caranday palm (Copernicia alba)—gallery forests, flooded pastures, and agricultural fields. It shows a remarkable tolerance for anthropogenic habitats, frequently settling in degraded rural areas, suburban parks, and urban green spaces where roosting sites and food resources are abundant.

Feeding: Classified as a generalist herbivore, its diet consists of a wide array of plant matter. It feeds extensively on seeds, wild fruits, berries, flowers, and young buds. It shares a strong ecological relationship with native palms, relying heavily on their nuts and seeds. In agricultural landscapes, it frequently feeds on commercial crops such as maize, sorghum, and sunflower seeds. This behavior often brings it into conflict with local farmers, as large, foraging flocks can cause localized damage to ripening crops.

Behavior: Highly social and gregarious, this species is rarely seen alone and is renowned for its noisy demeanor. Outside the breeding season, individuals gather in large, communal flocks that can range from dozens to several hundred members. Their flight is rapid, direct, and tightly synchronized, accompanied by loud, screeching, high-pitched calls that maintain group cohesion. They spend a significant portion of the day foraging in the upper canopy or occasionally descending to the ground. In the late afternoon, flocks congregate in traditional communal roosts, typically located in tall trees or dense palm stands, where they engage in intense social vocalization before settling for the night.

Nesting: Utilizing pre-existing tree hollows, this bird acts as a secondary cavity nester. It favors natural cavities in decaying or live tree trunks, fence posts, and abandoned woodpecker holes, especially within caranday palms (Copernicia). The breeding season typically spans from November to March. The female lays a clutch of 3 to 4 elliptical white eggs. The incubation period lasts between 21 and 25 days and is performed almost exclusively by the female, while the male provides her with food. Both parents actively participate in brooding and feeding the altricial chicks. The young fledge and leave the nest at approximately 50 days of age, though they remain dependent on parental care for several additional weeks.

Conservation status: Listed as Least Concern (LC) on the IUCN Red List of Threatened Species. Global populations are currently stable, and the species remains locally abundant throughout its native range. While historical capture for the international pet trade exerted localized pressure on populations, its high reproductive rate, ecological flexibility, and ability to exploit human-modified landscapes have helped buffer it against major declines.