Piovanello solitario

Identificazione

This species measures 18–23 cm (7.1–9.1 in) long, with a wingspan up to 50 cm (20 in) and a body mass of 31–65 g (1.1–2.3 oz). It is a dumpy wader with a dark green back, greyish head and breast and otherwise white underparts. It is obvious in flight, with wings dark above and below, and a dark rump and tail centre. The latter feature distinguishes it from the slightly larger and broader-winged, but otherwise very similar, green sandpiper (T. ochropus) of Europe and Asia, to which it is closely related. The latter species has a brilliant white rump. In flight, the solitary sandpiper has a characteristic three-note whistle. They both have brown wings with little light dots, and a delicate but contrasting neck and chest pattern. In addition, both species nest in trees, unlike most other scolopacids.

Tassonomia

Nome scientifico

Tringa solitaria

Autorità

Wilson, A, 1813

Ordine

Caradriformi

Famiglia

Scolopacidi

Genere

Tringa

Areale e habitat

It breeds in woodlands across Alaska and Canada. It is a migratory bird, wintering in Central and South America, especially in the Amazon River basin, and the Caribbean. It is a very rare vagrant to western Europe, and goes there in the summer–autumn period. <p>The solitary sandpiper is split into two subspecies:

Areale riproduttivo

NA : subarctic to temperate zone taiga muskeg of Nearctic: Alaska mainland (except far n), nw to sw Canada, e s of Hudson and James bays and n of Great Lakes to e Quebec (at least)

Areale non riproduttivo

MA, SA, Caribbean : inland subtropical to tropical small wetlands of Neotropics: wc Mexico, s Texas, and throughout the Caribbean to c Peru and nc Argentina

Migrazione

Complete migrants

Comportamento

As its name indicates, the solitary sandpiper is not a gregarious species, usually seen alone during migration, although sometimes small numbers congregate in suitable feeding areas. The solitary sandpiper is very much a bird of fresh water, and is often found in sites, such as ditches, too restricted for other waders, which tend to like a clear all-round view.<p>The sandpiper lays a clutch of 3–5 eggs in abandoned tree nests of songbird species, such as those of thrushes. The young birds are encouraged to drop to the ground soon after hatching.<p>Food is small invertebrates: insects (such as mosquito larvae, young midges, grasshoppers, caterpillars and beetles), small crustaceans and molluscs (such as snails extracted from their shells), sometimes small frogs (primarily as tadpoles), picked off the mud as the bird works steadily around the edges of its chosen pond.

Conservazione

Tendenza della popolazione

declining