Piccione codafasciata

Identificazione

It is the largest pigeon in North America, measuring 33 to 40 cm (13 to 16 in) long and weighing 225–515 g (7.9–18.2 oz). The coastal subspecies P. f. monilis (averaging 392 g (13.8 oz)) is larger than the inland subspecies (averaging 340 g (12 oz)). The band-tailed pigeon has a wingspan of 66 cm (26 in).<p>The plumage is gray, somewhat darker above. The head and underparts have a faint pink cast, especially in the adult male; the belly is nearly white. The distal half of the tail is also pale (except in the subspecies of Baja California), whence the English name. The bill and feet are yellow, with good identification marks at sufficiently close range. Adults have green iridescence on the back of the neck, adjacent to a thin white collar on the nape. Juvenile birds have white feather edges above, giving a scaly appearance.

Tassonomia

Its closest living relatives are the Chilean pigeon and the ring-tailed pigeon, which form a clade of Patagioenas with a terminal tail band and iridescent plumage on their necks. There are at least 8 sub-species, and some authorities split this species into the northern band-tailed pigeon (Patagioenas fasciata) and the southern band-tailed pigeon (Patagioenas albilinea).<p>The band-tailed pigeon is the closest living relative of the extinct passenger pigeon and has been investigated for being used in efforts to bring back that species.

Nome scientifico

Patagioenas fasciata

Autorità

(Say, 1822)

Ordine

Columbiformi

Famiglia

Columbidae

Genere

Patagioenas

Areale e habitat

It ranges from British Columbia, Washington, Oregon, California, and southern Arizona south in higher elevations through Mexico and Central America to northern Argentina. In autumn it migrates out of its permanent resident range into northern California, New Mexico, and parts of Utah and Colorado. It is found from almost sea level to 3,600 m (12,000 ft), generally in oak, pine-oak, and coniferous forests. It feeds on seeds, notably acorns, as well as berries and small fruits.

Migrazione

Complete migrants

Comportamento

This species is relatively quiet for a pigeon. Its voice is low-pitched and owl-like, often in two-syllable calls that rise and then fall (huu-ooh) with even spacing between calls. It also makes a variety of harsh squawking sounds for a variety of reasons.<p>It builds a rudimentary platform nest out of twigs, in which it lays one or two eggs. Outside the breeding season, it forms flocks, sometimes over 50 birds, and often becomes nomadic, following the acorn crop or moving to lower altitudes or other areas outside its breeding range. They commonly congregate at and drink from mineral springs, although it is not fully understood why. In addition to acorns and other seeds, the band-tailed pigeon will seasonally consume fruits such as Pacific madrona and Toyon berries. This species often visits bird feeders. With the introduction of English holly and English ivy, two popular plants in landscaping in western North America, the bird is found in persistent numbers in suburban areas now as well.<p>The parasitic louse Columbicola extinctus, believed to have become extinct with the extinction of the passenger pigeon, was recently rediscovered on the band-tailed pigeon.

Conservazione

Tendenza della popolazione

declining