The Arctic Warbler (Phylloscopus borealis) is a species of the Siberian coniferous zone, living at the western border of its distribution in Finland. In here, the species is a summer visitor, and is the latest one to migrate out of all out nesting birds. The bird arrives into our country as late as the end of June, and returns back to spend the winter in southeast Asia at the end of August. The Arctic Warbler migrates at night, and competes for the top spots among our nesting birds when it comes to the length of the migration journey. The nesting stock of the species during the last couple of years has been 3000 couples on the average.
The bird is difficult to identify on the field. The species nests in the northernmost Lapland east in Kainuu and north Karolia, so any warbler nest found in southern Finland doesn’t belong to the Arctic Warbler. Compared to the Willow Warbler, the Wood Warbler and the Common Chiffchaff, which are three out of the five Phylloscopus-warblers in our country, the Arctic Warbler can be distinguished by its wing lines and its browner overall coloration. In comparison to the Greenish Warbler, the shape of the head and the difference in eye stripes can be noticed. The Arctic Warbler is more slant-headed than the Greenish Warbler, and the eye stripe doesn’t extend to the forehead as white, as it does on the Greenish Warbler, but extends instead far into the neck together with the dark eye stripe, forming a basis for some kind of identification for the species.
The song is, for this warbler as well, the most crucial element in differentiating it from its relatives. The Arctic Warbler’s song doesn’t at all resemble the songs of our other warblers. It can be heard by clicking THIS.
The Arctic Warbler does its nesting in a manner similar to our other species of the Phylloscopus.
- Phylloscopus trochiloides Greenish Warbler idänuunilintu
- Phylloscopus sibilatrix Wood Warbler sirittäjä
- Phylloscopus trochilus Willow Warbler Pajulintu