Arctic Warbler
EN

Arctic Warbler

Phylloscopus borealis

UnknownLCEULCEU

Photo: Wikimedia Commons (CC) via https://en.wikipedia.org/wiki/Arctic_warbler

Overview

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.

The Arctic Warbler faces significant population declines primarily due to habitat loss from deforestation and agricultural conversion in both breeding and wintering grounds. Climate change is altering the timing of insect emergence, disrupting the species' breeding cycle and food availability during critical periods.

Threat summary

Habitat

TERRESTRIAL· major

Other threatened species in Phylloscopidae

Willow WarblerVU

Willow Warbler

Phylloscopus trochilus

Unknown
VU

Sombre Leaf-warbler

Phylloscopus amoenus

Unknown

Frequently asked questions

Why is Arctic Warbler classified as Endangered?
Arctic Warbler is classified as Endangered — facing a very high risk of extinction in the wild — because population numbers are declining steeply and key habitats are under sustained pressure. The Arctic Warbler faces significant population declines primarily due to habitat loss from deforestation and agricultural conversion in both breeding and wintering grounds. Climate change is altering the timing of insect emergence, disrupting the species' breeding cycle and food availability during critical periods.
Where does Arctic Warbler live?
Arctic Warbler occurs in across multiple regions. Country-level distribution data is sourced from the IUCN Red List and cross-referenced with GBIF occurrences.
What are the main threats to Arctic Warbler?
The main threats to Arctic Warbler are ai-1, ai-2, ai-3, and ai-4. The full IUCN-classified threat record for this species is detailed on the species page.

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