Distribution and Habitat
This species can be found across the greater part of Eurasia and the north of Africa. Its breeding area is separated into two zones, each side of the Palearctic ecozone: the east coast of Asia and the central and northern part of Europe.
These birds can be found throughout the year in Central Europe and some mountain ranges in the south of the continent. They are present in the north of Scandinavia and in Russia and they over-winter in the Mediterranean basin and the area around the Black Sea. In China they breed in the Khingan Mountains of Inner Mongolia and in Jiangsu province; they spend summer in Tibet, Taiwan, the valleys of the lower Yangtse River and the south east coast.
The Eurasian Siskin is occasionally seen in North America. There is also a similar and closely related North America counterpart, the Pine Siskin, Carduelis pinus.
Their seasonal distribution is also marked by the fact that they follow an anomalous migration pattern. Every few years they migrate southwards in larger numbers and the overwintering populations in the Iberian Peninsula are greatly augmented. This event has been the object of diverse theories, one theory suggests that it occurs in the years when Norway Spruce produces abundant fruit in the centre and north of Europe, causing populations to increase. An alternative theory is that greater migration occurs when the preferred food of alder or birch seed fails. This species will form large flocks outside the breeding season, often mixed with redpolls.
It is a bird that does not remain for long in one area but which varies the areas it used for breeding, feeding, over-wintering from one year to the next.
Its habitat is forested areas at a particular altitude on a mountain side and they have a certain predilection for humid areas. Coniferous woodland, especially Spruce, is favoured for breeding. It builds its nest in a tree, laying 2–6 eggs. The British range of this once local breeder has expanded greatly due to an increase in commercial conifer plantations. The Siskin also breeds in mixed woodland; while in winter they prefer stubble and crops and areas containing trees with seeds.
Read more about this topic: Eurasian Siskin
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