Rondine blu e bianca

Identificazione

The adult blue-and-white swallow averages 11–12 cm (4.3–4.7 in) long and weighs about 10 g (0.35 oz). It has dark blue upperparts and white underparts, and its underwings and the undersurface of its short forked tail are blackish. The juvenile is brown above, buff-tinted below, and has a less forked tail. The call is a buzzing dzzzhreeee.<p>There are three subspecies. The nominate N. c. cyanoleuca occurs from Nicaragua and Trinidad south to northwestern Argentina, Paraguay and Uruguay. The migratory southern race N. c. patagonica is larger, 13.5 cm (5.3 in), has paler underwings, and white basal undertail coverts. N. c. peruviana is restricted to coastal Peru up to 2,500 m (8,200 ft) altitude. It is smaller than patagonica, has less white in the undertail, darker underwings and duskier flanks.

Tassonomia

The blue-and-white swallow was first formally described as Hirundo cyanoleuca by the French ornithologist Louis Pierre Vieillot in 1817, based on a specimen he believed to be from Paraguay. The scientific name has the same meaning as the English common name.<p>This species was formerly placed in the genus Notiochelidon. It was moved to the resurrected genus Pygochelidon based on a phylogenetic study published in 2005.<p>Three subspecies are recognised:

Nome scientifico

Pygochelidon cyanoleuca

Autorità

(Vieillot, 1817)

Ordine

Passeriformi

Famiglia

Hirundinidae

Genere

Pygochelidon

Areale e habitat

This is a swallow of open areas including villages and towns, farms, and forest clearings. In Central America, it is a highland bird, but elsewhere in its range it can occur from the lowlands to an altitude of 4,000 m (13,000 ft).

Migrazione

Complete migrants

Comportamento

This species is often found in small flocks when not breeding. The blue-and-white swallow subsists primarily on a diet of insects, caught in the air; they have been seen to gather where termites swarm. The flight is typically fluttery, and this swallow frequently perches on wires or branches.<p>The blue-and-white swallow's shallow straw nest is built by both adults in a wide range of natural or man-made cavities include tree holes, rock crevices and bridges. The clutch is up to six white eggs in the south of the range, two or three in the north, which are incubated by both parents for 15 days to hatching. The nestlings are fed by both parents for 26 days to fledging, but return to the nest to sleep with the parents for up to two months. There may be two broods.

Conservazione

Tendenza della popolazione

declining