About Vanellus chilensis (Molina, 1782)
Vanellus chilensis, commonly known as the southern lapwing, is the only crested wader native to South America. It measures 32 to 38 cm (13 to 15 in) in length and weighs approximately 250 to 425 g (8.8 to 15.0 oz). Its upperparts are mostly brownish grey, with bronze glossing on the shoulders. The head has a distinct striking pattern: it is primarily grey, with a black patch covering the forehead, throat, and extending to the black breast. A white border separates the black facial markings from the grey of the head and crest. The rest of the underparts are white, while the eye ring, legs, and most of the bill are pink. This species has red bony wing spurs that it uses to intimidate enemies and fight birds of prey. During slow flapping flight, the southern lapwing displays a broad white wing bar that separates the grey-brown back and wing coverts from the black flight feathers. It has a white rump and a black tail, and produces a very loud, harsh keek-keek-keek call. There are three or four recognized subspecies, which differ slightly in head coloration and voice. Vanellus chilensis fretensis from Patagonia is sometimes grouped into the nominate subspecies V. c. chilensis. The two northern subspecies — V. c. cayennensis from the far north and V. c. lampronotus from south of the Amazon River — are sometimes classified as a separate distinct species, Vanellus cayennensis. These two subspecies have browner heads, a trait most prominent in the northernmost populations, and their white face band, broad in V. c. cayennensis and narrow in V. c. lampronotus, does not extend to the center of the crown. Intergradation between forms has been observed in birds from the Uruguay region. Ecologically, the southern lapwing inhabits lake and river banks, as well as open grassland. It has benefited from the expansion of open grassland habitat caused by widespread cattle ranching. When it nests near airports, it creates a hazard for aircraft safety. Its diet consists mainly of insects like grasshoppers, other small invertebrates including earthworms and cutworms, and small fish. It hunts using a run-and-wait technique, mostly at night, and often forages in flocks. In urban areas such as Rio de Janeiro, Montevideo, Buenos Aires, and La Plata, the species can even be seen feeding or walking in parks or on floodlit soccer pitches during televised matches. The southern lapwing breeds cooperatively in social groups, which are made up of a breeding pair plus one or two young from the previous breeding season. It breeds on grassland and sometimes on ploughed fields, and performs an aerobatic flapping display flight during courtship. It lays 2 to 3, rarely 4, olive-brown eggs in a scrape on bare ground. Both the nest and young are defended loudly and aggressively against all intruders including humans, using threat displays, vocalizations, and low flights. After the breeding season, the species disperses to wetlands and seasonally flooded tropical grassland.
