Arctic Warbler

Phylloscopus borealis(J.H.Blasius, 1858)

Order: Passeriformes
Family: Phylloscopidae
Presence in the Strait: Vagrant
In Spanish: Mosquitero boreal

Photograph: Arctic_Warbler_4683.jpg: Alnus derivative work: Osado, CC BY-SA 3.0, vía Wikimedia Commons

Length: 12 cm

Presence in the Strait

Accidental. One bird at Gibraltar on 30.10.84.

Identification

Like a Willow Warbler but with duller tones, without yellow. Greenish-grey upperparts and diffusely streaked underparts. Long and conspicuous black eye-stripe and pale, long and narrow supercilium. Short, narrow whitish wing-bar and dusky flanks. They breed in Fenno-Scandia.

Bioestrecho editorial text. Last revised: 8 September 2026.

Photographs from iNaturalist observations with the licence checked file by file. Those marked “Strait” were taken within the area; place and date are those of each observation.

Calendar in the Strait

No observations with a compatible licence in the area, or taxon without a match in GBIF.

Same genus in the Strait

Willow Warbler11.5–11.5 cm · Migrant
Wood Warbler12.5–12.5 cm · Migrant
Common Chiffchaff11–11 cm · Seasonal
Western Bonelli´s Warbler11–11 cm · Seasonal
Mountain Chiffchaff11–11 cm · Vagrant

Species of the same genus that also occur here, ordered by how close they are in size. Being relatives does not mean they are confused in the field, but that is where the doubts start: compare size and season.

Classification

Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Passeriformes
Family: Phylloscopidae
GBIF taxon key: 2493071

Sources

Distribution and calendar: GBIF, live query
Photograph: Arctic_Warbler_4683.jpg: Alnus derivative work: Osado, CC BY-SA 3.0, vía Wikimedia Commons
Taxonomy: GBIF backbone, pending WoRMS for marine taxa
Editorial text: written by Bioestrecho
Last revised: 8 September 2026

Arctic Warbler

Presence in the Strait

Identification

Gallery