Scricciolo

Identificazione

The Eurasian wren is a plump, sturdy bird with rounded wings and a short tail, which is usually held cocked up. The adult bird is 9 to 10 cm (3.5 to 3.9 in) in length and has a wingspan of 13–17 cm (5.1–6.7 in). It weighs around 10 g (0.35 oz). It is rufous brown above, greyer beneath, and indistinctly barred with darker brown and grey, even on the wings and tail. The bill is dark brown and the legs are pale brown, the feet having strong claws and a large hind toe. Young birds are less distinctly barred and have mottled underparts. The plumage is subject to considerable variation, and where populations have been isolated, the variation has become fixed in one minor form or another.<p>The most common call is a sharp, repeated "tic-tic-tic", similar but faster and with less isolated notes compared to that of a robin. When the bird is annoyed or excited, its call runs into an emphatic churr, not unlike clockwork running down. The song is a gushing burst of sweet music, clear, shrill and emphatic. The male has remarkably long and complex vocalizations, with a series of tinkling trills one after the other for seconds on end. The bird has an enormous voice for its size, ten times louder, weight for weight, than a cockerel. The song begins with a few preliminary notes, then runs into a trill, slightly ascending, and ends in full clear notes or another trill. At any season the song may be heard, though it is most noticeable during spring. Despite its generally mouse-like behaviour, the male may sing from an exposed low perch as its whole body quivers from the effort. Its song may sometimes be confused with that of the dunnock, which has a warble that is shorter and weaker. The wren's song also incorporates repeated trill sounds while the dunnock's does not.

Tassonomia

The Eurasian wren was described by the Swedish naturalist Carl Linnaeus in 1758 in the tenth edition of his Systema Naturae under the binomial name Motacilla troglodytes. The specific epithet is from the Ancient Greek trōglodutēs meaning "cave-dweller". In 1555 the German naturalist Conrad Gessner had used the Latin name Passer troglodyte for the Eurasian wren in his Historiae animalium. The species is now placed in the genus Troglodytes that was introduced by the French ornithologist Louis Pierre Vieillot in 1809.<p>The Eurasian wren was formerly considered conspecific with two North American species: the winter wren (Troglodytes hiemalis) and the Pacific wren (Troglodytes pacificus). Some ornithologists place the Eurasian wren, the winter wren and the Pacific wren in a separate genus Nannus that was introduced by the Swedish naturalist Gustaf Johan Billberg in 1828 with the Eurasian wren as the type species.<p>It was estimated that Troglodytes pacificus and Troglodytes troglodytes last shared a common ancestor approximately 4.3 million years ago, long before the glacial cycles of the Pleistocene, thought to have promoted speciation in many avian lineages inhabiting the boreal forest of North America.<p>There are 28 recognised subspecies of this taxonomically complex bird. The disputed subspecies T. t. orii, the Daito wren, became extinct around 1940 – if it was indeed a valid taxon and not merely based on an anomaly. Thus in Scotland, in addition to the typical bird T. t. indigenus, there are three distinct insular subspecies: one, T. t. hirtensis, is confined to the island of St Kilda; another, T. t. zetlandicus, to the Shetland Islands; and the third, T. t. fridariensis, to Fair Isle. The St Kilda wren is greyer above, whiter beneath, with more abundant bars on the back; the Shetland wren and Fair Isle wren are darker.

Nome scientifico

Troglodytes troglodytes

Autorità

(Linnaeus, 1758)

Ordine

Passeriformi

Famiglia

Troglodytidae

Genere

Troglodytes

Areale e habitat

The Eurasian wren is a Palearctic species. The nominate race breeds in Europe as far north as 67°N in Norway and 64°N in Sweden, Finland and Russia. The bird's southern limit is northern Spain, southern France, Italy, Sicily and southern Russia. It also breeds in Western Asia as far east as Syria. It is replaced by other races in Iceland, the Faroe Islands, Shetland, the Hebrides, and St Kilda, and further south in northwestern Africa, Spain and Portugal, the Balearic Islands, Corsica, Sardinia, Crete and Cyprus. Other races also occur in southern Russia and Japan.<p>It occupies a great variety of habitats, typically any kind of cultivated or uncultivated area with bushes and low ground cover; gardens, hedgerows, thickets, plantations, woodland and reed beds. It inhabits more open locations with clumps of brambles or gorse, rough pasture, moorland, boulder-strewn slopes, rocky coasts and sea cliffs.

Migrazione

Migratori completi

Comportamento

Comportamento migratorio: Migratori completi.

Conservazione

Tendenza della popolazione: in aumento.

Tendenza della popolazione

in aumento