Arctic Warbler

Phylloscopus borealis

The Arctic warbler is a widespread leaf warbler in birch or mixed birch forest near water throughout its breeding range in Fennoscandia and the northern Palearctic. It has established a foothold in North America, breeding in Alaska. This warbler is strongly migratory; the entire population winters in southeast Asia. It therefore has one of the longest migrations of any Old World insectivorous bird. Source

Where it is now

In the last 8 weeks this bird was recorded 7,313 times across 29 areas (each area is a 5 degree square).

See the Arctic Warbler on the live map

Movement and weather

Over the weeks it was present in the past year, its centre in Asia ranged from 3°N in November to 26°N in May, about 2,600 km apart.

Arrival dates

The week it was first heard regularly in each region, after at least six weeks away. Dates differ from south to north, so a region has a range.

Download every area as CSV

Figures are effort corrected and come from automatic sound identification, which makes mistakes. How this is measured and how it compares with human observers.