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
2021-02-23 06:45Chiang Mai University--Mae Hia Agricultural College1
2021-03-03 08:00Karon Viewpoint1
2021-02-26 06:30Ban Khlong Ta Bak2
2021-02-20 13:20Wat Tham Prathun (Tham Prathun Temple)1
2021-02-21 08:02Khao Yai NP--Mo Singto Reservoir1
2021-02-12 07:30Khao Yai NP--youth camp and Suraswadi lodges1
2021-02-21 08:16Khao Yai NP--Haew Narok Waterfall trail2
2021-02-27 07:30Sungai Burung, Pulau Pinang5
2021-03-04 07:10Penang Botanical Gardens3
2021-02-16 07:45Pulau Burung Landfill3
2021-02-21 08:35Khao Chamao – Khao Wong NP (general area)1
2021-03-04 07:00Man Nai Island (Ko Man Nai)1
2021-02-14 14:58Khlong Pla Khun1
2021-02-04 08:40Wat Phnom1
2021-03-03 11:19Sungei Buloh Wetland Reserve1
2021-02-06 17:20Neo Tiew Harvest Lane1
2021-03-02 08:27Sungei Buloh Wetland Reserve - East inc. Kranji Nature Trail1
2021-02-14 07:57Kranji Marsh1
2021-02-20 17:21Jurong Lake Gardens (inc. Chinese Garden and Japanese Garden)1
2021-03-02 17:17Choa Chu Kang Park1
2021-02-27 10:42Marsiling Park2
2021-02-04 10:23Sungei Ulu Pandan2
2021-02-20 15:02Admiralty Park1
2021-03-03 17:05Bukit Batok Nature Park1
2021-02-07 07:43Singapore Quarry at Dairy Farm Nature Park1
2021-03-04 16:16West Coast Park: west1
2021-02-27 14:40Dairy Farm Nature Park2
2021-03-01 14:11Bukit Timah Nature Reserve2
2021-02-23 06:50Hindhede Nature Park1
2021-02-12 09:25Kent Vale, National University of Singapore1
2021-03-02 16:55Clementi Forest and Green Corridor at King Albert Park2
2021-02-28 07:08Central Catchment Nature Reserve5
2021-02-13 12:13Upper Seletar Reservoir Park (USRP) inc. Mandai Road Track 7 / Nee Soon Swamp Forest1
2021-03-03 07:25Rifle Range Link1
2021-02-15 08:48Dillenia Hut1
2021-02-14 08:26Sime Forest1
2021-02-27 11:14Kent Ridge Park1
2021-03-03 08:39Upper Peirce Reservoir Park1
2021-02-27 07:15CCNR--Jelutong Tower2
2021-02-10 11:30Southern Ridges2
2021-03-04 17:07Labrador Nature Reserve1
2021-02-06 09:59Lower Seletar Reservoir Park1
2021-02-26 08:05Berlayer Creek Boardwalk1
2021-02-07 08:55Singapore Botanic Gardens Eco Lake1
2021-02-24 11:17Singapore Botanic Gardens1
2021-02-03 09:22Windsor Nature Park including Venus Drive and Venus Loop1
2021-02-13 10:33Telok Blangah Hill Park1
2021-02-20 07:15Bukit Brown Cemetery1
2021-02-16 18:15MacRitchie Reservoir Park1
2021-02-14 18:00Seah lm1
2021-02-28 10:00Mount Rosie / Malcolm Road: forest patch1
2021-02-27 17:15Bishan-Ang Mo Kio Park1
2021-02-21 12:00Hampstead Wetlands Park (formerly Baker St. pond)1
2021-03-04 08:00Gardens by the Bay2
2021-02-27 07:13Satay by the Bay1
2021-02-06 08:00Marina East (Gardens by the Bay: Bay East / Marina Barrage)1
2021-02-15 11:36Pasir Ris Park1
2021-02-14 08:57Tampines Eco Green2
2021-02-07 08:03Pulau Ubin1
2021-02-27 07:30Changi Business Park canal2
2021-02-05 07:15Changi Business Park1
2021-02-03 08:03嘉義鰲鼓濕地IBA--四號賞鳥亭(Aogu Wetland IBA--Pavilion #4)1
2021-02-04 10:34嘉義鰲鼓濕地IBA--觀海樓(Aogu Wetland IBA--Guanhai Building)1
2021-02-07 11:09嘉義鰲鼓濕地IBA--全區(Aogu Wetland IBA)(New)1
2021-02-18 10:23台南--安平樹屋與德記洋行(Tainan--Anping Tree House & Former Tait & Co. MErchant House)1
2021-02-12 06:50台南--歸仁台糖沙崙農場(Tainan--Guiren TSC Shalun Farm)1
2021-02-20 10:00高雄壽山NNP--半屏湖濕地公園(Shoushan NNP--Banping Lake Wetlands Park)1
2021-02-25 09:18高雄--高雄都會公園(Kaohsiung--Kaohsiung Metropolitan Park)1
2021-02-19 08:59高雄--衛武營都會公園(Kaohsiung--Weiwuying Metropolitan Park)1
2021-02-23 09:34高雄--鳥松濕地(Kaohsiung--Niaosong Wetland)2
2021-02-12 11:20高雄--澄清湖(Kaohsiung--Chenching Lake)1
2021-03-04 08:45高雄--南星計畫區(繫放站)(Kaohsiung--Nanxing Planning District (Banding Spot))1
2021-03-02 08:00高雄--鳳山鳳凰山(Kaohsiung--Fengshan Fenghuang Hill)4
2021-02-10 08:24雲林--虎尾惠來里(Yunlin--Huwei Huilai Village)1
2021-02-05 07:09嘉義--八掌溪軍輝橋上游攔砂壩(Chiayi--Bazhang River Check Dam above Junhui Bridge)1
2021-02-24 08:00嘉義--嘉義大學蘭潭校區(Chiayi--NCYU Lantan Campus)1
2021-02-21 15:18雲林--他里霧埤公園(Yunlin--Taliwu Pond Park)1
2021-02-07 07:56高雄--中寮山新南巷(Kaohsiung--Zhongliaoshan Xinnan Alley)2
2021-03-02 16:30高屏溪IBA--武洛溪下游(Kaoping River IBA--Wuluo River Downstream)3
2021-02-20 06:34台中--台中都會公園(Taichung--Taichung Metropolitan Park)1
2021-02-06 09:00雲林湖本IBA--龍過脈步道(Huben IBA--Longkuomai Forest Trail)1
2021-02-22 12:24嘉義--大埔情人公園(Chiayi--Dapu Lovers' Park)3
2021-02-06 08:30屏東--內埔六堆客家文化園區(Pingtung--Neipu Liudui Hakka Cultural Park)1
2021-02-21 10:31嘉義--竹崎圓潭瀑布(Chiayi--Zhuqi Yuantan Waterfall)1
2021-02-21 13:49屏東--東港溪老埤段(Pingtung--Donggang River Laopi Section)1
2021-02-12 10:32高雄--六龜新威森林公園(Kaohsiung--Liugui Xinwei Forest Park)2
2021-03-02 09:00屏東--屏東科技大學(Pingtung--Pingtung University of Science and Technology)1
2021-02-21 09:49屏東--屏東科技大學靜思湖(Pingtung--NPUST Jingsi Lake)3
2021-02-18 06:31台中--大里溪大坑段(Taichung--Dali River Dakeng Reach)1
2021-02-05 11:11高雄茂林國家風景區--多納高吊橋(Maolin NSA--Duonagao Suspension Bridge)1
2021-02-14 06:59台中--霧峰青桐林生態園區(Taichung--Wufeng Qingtonglin Eco-Industrial Park)2
2021-02-05 07:02南投--集集清水溪(公館橋-林尾橋)(Nantou--Jiji Qingshui Creek (Between Gongguan Bridge & Linwei Bridge))1
2021-02-07 10:52屏東--北大武山林道(大武山之門-新登山口)(Pingtung--Mt. North Dawu Forest Trail (between Milestone Gate of Mt. Dawu & New Hiking Gate))2
2021-02-21 09:33南投--集集清水溪(大芒果樹-大園橋-八張橋)(Nantou--Jiji Qingshui Creek (Big Mango Tree-Dayuan Bridge-Bazhang Bridge)1
2021-03-05 07:57南投--集集特有生物研究保育中心(Nantou--Jiji Endemic Species Research Institute)1
2021-02-07 13:23台中--東勢林業文化園區(Taichung--Dongshi Forestry Culture Park)1
2021-02-21 10:14新竹濱海IBA--港南金城湖(Hsinchu Coast IBA--Gangnan Jincheng Lake)1
2021-02-14 07:30新竹濱海IBA--港南全區(Hsinchu Coast IBA--Gangnan)2
2021-02-14 11:02新竹--竹北原生林保護區(Hsinchu--Zhubei Original Forest Reserve)2
2021-02-12 10:37墾丁NP--龍鑾潭自然中心(Kenting NP--Longluan Lake Nature Center)2
2021-02-17 17:03南投--信義望鄉(Nantou--Xinyi Wangxiang)1
2021-02-15 06:15Cabayaoasan Ponds, Bugallon1
2021-02-07 08:43台中--八仙山森林遊樂區(Taichung--Basianshan Forest Recreation Area)1
2021-02-22 07:58南投--惠蓀林場(Nantou--Huisun Forest Area)1
2021-02-21 11:52南投--奧萬大森林遊樂區(Nantou--Aowanda Forest Recreation Area)1
2021-02-15 14:18台東--利嘉溪口(Taitung--Lijia River Mouth)2
2021-02-14 16:01台東--鯉魚山公園(Taitung--Liyu Hill Park)4
2021-02-06 08:30台東--池上大坡池濕地(Taitung--Chishang Dapochih Wetland)2
2021-03-01 12:42台北關渡IBA--全區(含自然公園、保留區、島頭公園)(Guandu IBA)1
2021-02-06 08:32台北關渡IBA--自然公園西南區(Guandu IBA--Nature Park SW Area)2
2021-02-27 14:50台北關渡IBA--自然公園(Guandu IBA--Nature Park)1
2021-02-14 15:06台北關渡IBA--自然公園東南區(Guandu IBA--Nature Park Southeast Area)1
2021-02-28 10:30台北--北投貴子坑大排(Taipei--Beitou Guizikeng Drainage Canal)1
2021-02-07 07:35台北--番仔溝→貴子坑大排(Taipei--Fanzaigou to Guizikeng Drainage Canal)[台北鳥會例行路線(WBST Birdwatching Route)]1
2021-02-07 07:41台北--立農濕地(Taipei--Linong Wetland)1
2021-02-07 07:50台北--北投立農濕地(Taipei--Beitou Linong Wetland)1
2021-03-03 13:10台北--台北植物園(Taipei--Taipei Botanical Garden)1
2021-03-05 08:58台北--大安森林公園(Taipei--Da'an Forest Park)1
2021-02-07 14:30台北--新店碧潭橋(Taipei--Xindian Bitan Bridge)1
2021-02-21 14:11台北--國立臺灣大學校總區(Taipei--National Taiwan University Main Campus)1
2021-02-20 10:00台北--國立臺灣大學實驗農場(Taipei--NTU Experimental Farm)1
2021-02-07 06:10台北--新店四崁水(Taipei--Xindian Sikanshui)
2021-03-04 08:13台北--南港公園(Taipei--Nangang Park)1
2021-02-21 06:34Canarem Lake and Bird Sanctuary, Victoria2
2021-02-21 09:12台北--南港山步道(Taipei--Nangangshan Trail)1
2021-02-07 13:35台北金山--金山青年活動中心(Jinshan--Jinshan Youth Activity Center)3
2021-02-28 07:16太魯閣NP--布洛灣(Taroko NP--Buluowan)1
2021-02-11 11:50花蓮花蓮溪口IBA(Hualien River Estuary IBA)1
2021-02-18 11:28花蓮--美崙山公園(Hualien--Meilunshan Park)1
2021-02-23 07:00Caylabne Bay Resort, Ternate1
2021-02-21 15:00NLEX--Total Gas Station1
2021-03-04 11:55宜蘭--羅東林場(Yilan--Luodong Forestry Culture Garden)1
2021-02-27 12:54台北--深澳漁港(Taipie--Shen`ao Harbor)1
2021-02-07 10:36宜蘭--南澳原生樹木園區(Yilan--Nan'ao Native Arboretum)1
2021-02-03 11:09宜蘭蘭陽溪口IBA--北岸東港防風林(Lanyang River Estuary IBA---Donggang Coastal Forest)1
2021-02-06 13:35宜蘭蘭陽溪口IBA--季新(Lanyang River Estuary IBA--Jixin)1
2021-02-28 11:01宜蘭--頂寮生態公園(Yilan--Dingliao Ecological Park)1
2021-02-28 16:24台北--田寮洋濕地(Taipei--Tianliaoyang Wetland)1
2021-02-25 08:05Arroceros Forest Park, Manila4
2021-02-08 08:00Ateneo de Manila University1
2021-02-12 07:30Km.98 Marilaque Highway, Infanta1
2021-02-12 06:45Pasonanca Natural Park, Zamboanga City--Baluno1
2021-02-10 06:00Eden Nature Park and Resort, Toril, Davao City1
2021-02-23 06:30Brgy. Matina Pangi, Davao City1