Fanello nordico

Identificazione

The twite is similar in size and shape to a linnet, at 13 to 13.5 cm (5.1 to 5.3 in) long. It lacks the red head patch and breast shown by the linnet and the redpolls. It is brown streaked with black above, and a pink rump. The underparts are buff to whitish, streaked with brown. The conical bill is yellow in winter and grey in summer. The call is a distinctive twit, from which its name derives, and the song contains fast trills and twitters. Twites can form large flocks outside the breeding season, sometimes mixed with other finches on coasts and salt marshes. They feed mainly on seeds.

Tassonomia

In 1758 the Swedish naturalist Carl Linnaeus included the twite in the 10th edition of his Systema Naturae under the binomial name Fringilla flavirostris. The genus name linaria is the Latin for a linen-weaver, from linum, "flax" and flavirostris means "yellow-billed". The twite and the closely related linnets were at one time placed in the genus Carduelis but were moved to a separate genus Linaria based on a phylogenetic analysis of mitochondrial and nuclear DNA sequences that was published in 2012.<p>There are 10 recognised subspecies:

Nome scientifico

Linaria flavirostris

Autorità

(Linnaeus, 1758)

Ordine

Passeriformi

Famiglia

Fringillidae

Genere

Linaria

Areale e habitat

Areale riproduttivo

PAL : low Arctic to temperate nw and montane c Palearctic in open areas: n, c British Is., w, n Scandinavia; disjunctly Caucasus and sc, ne Turkey e through sc Russia, n Kazakhstan, n, w Xinjiang (nw China) and Mongolia, in s nw Iran, c Afghanistan through Altai region, nw Himalayas e to Nepal and Tibet to Qinghai and Gansu (nc China)

Areale non riproduttivo

to lower elevations and southward

Migrazione

Complete migrants

Comportamento

The twite breeds in northern Europe and across the Palearctic to Siberia and China. Treeless moorland is favoured for breeding. It builds its nest in a bush, laying 5–6 light blue eggs. It is partially resident, but many birds migrate further south, or move to the coasts. It has declined sharply in parts of its range, notably in Ireland.<p>In the UK, the twite is the subject of several research projects in the Pennines, the Scottish Highlands and on the North Wales and Lancashire coastlines. Records show that the birds to the east of the Pennine hills move to the southeast coast in winter and those to the west winter between Lancashire and the Hebrides. The Welsh population winters almost exclusively in Flintshire. Ringing data has revealed that twite breeding in different parts of Britain use different non‐breeding areas, and that non-breeding areas of British twite do not overlap with non-breeding areas of continental twite.

Conservazione

Tendenza della popolazione

declining