Arctic Warbler (Phylloscopus borealis)
Illustration redrawn by AI from a real photograph

Arctic Warbler

Phylloscopus borealis (Blasius, JH, 1858)

≈12 cmLength11 gWeight

This leaf warbler has gray-green upperparts, grayish-white underparts and a single wing patch.

Busiest months: October · Most records: China, Singapore, Philippines

Looks like Greenish Warbler

Least Concern

How to identify

Field marks

  1. Gray-green upperparts
  2. Grayish-white underparts
  3. A single wing patch
  4. Rather heavy, dagger-shaped bill; dark tip to lower mandible

Voice

Song is a rapid trill.

Similar species

Where and when it's recorded

Arctic Warbler has been recorded at 1,167 of the 8,171 birding hotspots we track, in 30 countries and regions.

Records by month Northern Hemisphere

Where it's recorded most

  1. GambellUnited States1,223 records
  2. Singapore Botanic GardensSingapore1,194 records
  3. Taipei – National Taiwan University Main CampusTaiwan (China)1,019 records
More places
  1. Taipei – Taipei Botanical GardenTaiwan (China)1,011 records
  2. Dairy Farm Nature ParkSingapore979 records
  3. Sungei Buloh Wetland ReserveSingapore713 records
  4. Yeliu IBATaiwan (China)689 records
  5. Yilan – Dingliao Ecological ParkTaiwan (China)651 records
  6. Po ToiHong Kong (China)650 records
  7. Taipei – Tianliaoyang WetlandTaiwan (China)618 records

Countries and regions with the most records

ChinaSingaporePhilippinesThailandMalaysiaUnited StatesSouth KoreaMongolia

eBird records via GBIF up to 2024-12-31. A record means someone listed it; more records partly mean more birders, not more birds.

About

The Arctic warbler (Phylloscopus borealis) 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.

Excerpt from Wikipedia, CC BY-SA 4.0 · authors · Read more on Wikipedia

Questions

How big is the Arctic Warbler?

The Arctic Warbler is about ≈12 cm long and weighs around 11 g.

Where does the Arctic Warbler live?

Its breeding range: Palearctic, North America: Fennoscandia (northern Europe) through Siberia and Mongolia to Russian Far East (except Kamchatka) to northeastern China; also western Alaska. It is most often recorded in China, Singapore and Philippines.

When is the best time to see the Arctic Warbler?

At the hotspots we track, it is recorded most in October (Northern Hemisphere).

Is the Arctic Warbler endangered?

The IUCN Red List classifies the Arctic Warbler as Least Concern.

What does the Arctic Warbler eat?

Main food: Insects & other invertebrates.

What family is the Arctic Warbler in?

It belongs to the family Leaf Warblers (Phylloscopidae), order Passerines (Passeriformes).

At a glance

Length
≈12 cm
Weight
11 g
Habitat
Forest
Diet
Insects & other invertebrates
Lifestyle
Perches in trees
Migration
Migratory
Conservation
Least Concern
More measurements
Wing
66 mm
Tail
47 mm
Bill
14 mm
Tarsus
18 mm

Averages from the AVONET dataset; length from field guides where available.

Range

Palearctic, North America: Fennoscandia (northern Europe) through Siberia and Mongolia to Russian Far East (except Kamchatka) to northeastern China; also western Alaska

Breeding range, IOC World Bird List 15.2

Classification

Order
Passerines Passeriformes
Family
Leaf Warblers Phylloscopidae
Genus
Phylloscopus

Other birds in the genus Phylloscopus

Arctic Warbler

Download illustration

Free to use with credit: “Illustration: Bird Album (birdalbum.com)”. Drawn by AI from a reference photo by Arctic_Warbler_4683.jpg: Alnus derivative work: Osado. ↗

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