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 northern Asia. 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.

It traditionally included populations that breed in Kamchatka, the Kuril Islands and Japan, but genetic and vocal evidence strongly suggested these should be treated as separate species, and are all now considered distinct with the Kamchatka leaf warbler in Kamchatka, Hokkaido and the Kuril Islands, and the Japanese leaf warbler in Japan (except Hokkaido).

The nest is on the ground in a low shrub. Like most Old World warblers, this small passerine is insectivorous.

This is a typical leaf warbler in appearance, greyish-green above and off-white below. Its single wing bar distinguishes it from most similar species except the greenish warbler, Phylloscopus trochiloides. It is larger than that species and has a heavier, dagger-like bill, with a dark tip to the lower mandible. Its song is a fast trill.

This species occurs as an autumn vagrant in western Europe and is annual in Great Britain.

The genus name Phylloscopus is from Ancient Greek phullon, "leaf", and skopos, "seeker" (from skopeo, "to watch"). The specific borealis is from Latin and means "northern".
Arctic Warbler
Date Location Count
2021-06-12 12:50Denali Hwy--Sevenmile Lake Overlook (MP P7.0)1
2021-06-12 17:00Clearwater Creek Bridge (MP P55.7 Denali Hwy)2
2021-06-12 10:34Susitna River Bridge (MP P79.5 Denali Hwy)1
2021-06-11 11:39Denali Hwy--Seattle Creek Bridge (MP P111.3)1
2021-06-08 16:35Denali NP&P--Savage River Loop Trail1
2021-06-12 08:25Denali NP&P--Polychrome Overlook1
2021-06-08 09:57Council (town)1
2021-06-11 14:00Bear River (Nome-Council Rd)1
2021-06-11 16:35Nome-Council Road1
2021-06-10 15:51East Fork Solomon River (Nome-Council Rd)1
2021-06-09 12:28Cape Nome1
2021-06-12 12:35Nome--Salmon Lake Campground4
2021-06-09 11:28Hastings Creek (Nome-Council Rd)1
2021-06-09 10:40Nome-Council Rd/Fort Davis High Rd turnoff2
2021-06-12 06:20Nome-Kougarok Road1
2021-06-09 07:42Nome River (Nome-Kougarok Rd)2
2021-06-09 10:16Nome (town)1
2021-06-06 08:30Nome-Teller Hwy--Six Mile Pond1
2021-06-09 10:02Penny River (Nome-Teller Hwy)3
2021-06-10 16:08Nome-Teller Hwy1
2021-06-11 14:01Right Fork Bluestone River (Nome-Teller Hwy)2
2021-06-05 16:19Gambell--Far Boneyard1
2021-06-05 15:16Gambell (general area)1
2021-06-01 07:44Burd Lake, Baruunbayan-Ulaan, Uvurkhangai, MN1
2021-05-15 17:46Arvaikheer city, Uvurkhangai, MN3
2021-05-20 08:45Man Nai Island (Ko Man Nai)1
2021-05-22 16:00Темнохвойная тайга на реке Снежной (Dark Taiga near Snezhnaya River)1
2021-05-23 08:00Выдрино (Vydrino)4
2021-06-05 09:14Khustain Nuruu National Park2
2021-05-16 09:30沙湖--鸟岛 (Shahu--Bird Island)1
2021-06-04 05:40Mongolica Resort, UB, MN5
2021-06-03 05:53Nogoon nuur7
2021-06-03 13:38Seol Club3
2021-05-30 09:00Смешанный лес севернее д. Гурульба (Mixed Wood N from Gurulba Village)3
2021-06-01 07:23Gun Galuut NR, UB, MN3
2021-06-01 10:34Steppe Nomads Camp, Gun Galuut NR, Khentii, MN2
2021-06-06 07:34Khurkh Bird Ringing Station, Khentii, MN2
2021-05-18 07:00汉口江滩 (Hankou Mudflats)50
2021-05-25 09:17Mount Davis1
2021-06-08 12:51Chukh lake, Dashbalbar, Dornod, MN1
2021-05-22 11:04千灵山 (Qianling Shan)2
2021-05-27 10:45北京植物园 (Beijing Botanical Garden)1
2021-05-29 08:22圆明园 (Yuanmingyuan Relic Park)1
2021-06-01 07:09北京大学 (Peking University)1
2021-05-31 14:00清华大学 (Tsinghua University)1
2021-05-23 07:30奥林匹克森林公园-南园 (Olympic Forest Park-South Park)2
2021-05-28 15:20奥林匹克森林公园 (Olympic Forest Park)4
2021-05-22 09:56天坛公园 (Temple of Heaven)5
2021-05-30 14:00全国农业展览馆 (China Agricultural Exhibition Center)1
2021-05-30 10:58朝阳公园 (Chaoyang Park)
2021-06-03 07:55红领巾公园 (Red Scarf Park)1
2021-05-26 17:00温榆河 (Wenyu River)3
2021-05-22 10:38大运河森林公园 (Grand Canal Forest Park)1
2021-05-20 09:00天津水上公园 (Tianjin Water Park)5
2021-05-23 09:36汉沽滨海林地 (Hangu Coast Trees)10
2021-05-30 16:49南盐公园 (Nanyan Park)3
2021-06-01 06:32南堡滩涂 (Nanpu Mudflat)1
2021-05-26 10:11监狱树 [限制进入] (Prison Trees [Restricted access])3
2021-05-20 10:39金門--茅山塔(Kinmen--Maoshan Pagoda)1
2021-05-17 05:45金門--浯江溪口(Kinmen--Wujiang River Estuary)1
2021-05-24 06:00金門--全區(Kinmen)1
2021-05-19 06:00金門--金門植物園(Kinmen--Botanical Garden)2
2021-05-22 06:53金門--斗門登山古道(Kinmen--Doumen Hiking Trail)1
2021-05-15 15:10金門--農業試驗所(Kinmen--Agricultural Research Institute)2
2021-05-24 09:21西溪国家湿地公园 (Xixi National Wetland Park)1
2021-05-20 07:00江洋畈生态公园 (Jiangyangfan Eco-Park)2
2021-05-17 11:57西湖文化广场 (West Lake Cultural Square)1
2021-05-18 11:55青岛植物园 (Qingdao Botanical Garden)3
2021-05-24 09:20大公岛省级自然保护区 (Dagong Island PNR)2
2021-05-20 17:10台南七股IBA--全區(Qigu IBA)1
2021-05-24 13:05Napsan, Puerto Princesa City1
2021-05-24 10:30大莲湖 (Dalian Lake)2
2021-05-20 09:14天马山 (Tianma Mountain)1
2021-05-15 09:00后滩公园 (Houtan Park)1
2021-05-25 09:35世纪公园 (Century Park)1
2021-06-05 13:07南汇东滩 (Nanhui Dongtan)1
2021-05-22 14:55小洋山岛 (Lesser Yangshan Island)1
2021-05-28 15:00向海国家级自然保护区 (Xianghai NNR)1
2021-06-05 05:05Baekryeong Island1
2021-05-23 09:10전라남도 홍도 Hong Island1
2021-05-30 05:45Heuksan Island-- North: Heuksan Myeon1
2021-05-24 06:04충청남도 외연도 Oeyeon Island4
2021-05-19 07:55서울 한강 - 강서습지생태공원 Han River--Gangseo Parks6
2021-05-21 09:09서울 남산야외식물원 Nam Mountain Park1
2021-05-20 09:13Changgyeonggung2
2021-05-24 12:06Namsan-NTofKorea1
2021-05-23 06:59서울 올림픽공원 Olympic Park, Seoul1