Species Profile
Yellow-browed Warbler
Phylloscopus inornatus
Yellow-browed Warbler
Quick Facts
Conservation
LCLeast ConcernLifespan
2–4 years
Length
10–11 cm
Weight
5–9 g
Wingspan
15–18 cm
Migration
Long-distance Migrant
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Appearance
The Yellow-browed Warbler is a tiny, olive-green warbler with distinctive yellow eyebrows (supercilium) and two pale wing bars. Its underparts are whitish with a slight yellow tinge, and it has a thin, dark bill and legs.
Males and females are virtually identical in appearance. Juveniles closely resemble adults but may have slightly duller plumage and less distinct markings.
Identification & Characteristics
Colors
- Primary
- Olive
- Secondary
- White
- Beak
- Black
- Legs
- Brown
Attributes
Understanding Attributes
Rated 0–100 based on research and observation. A score of 50 is average across all bird species. These attributes are relative and don't necessarily indicate superiority.
Habitat & Distribution
Yellow-browed Warblers breed in the taiga forests of northern Asia, from eastern Russia to northeastern China. They prefer coniferous and mixed woodlands with a dense understory for nesting.
During winter, they migrate to southern Asia, including India and Southeast Asia. In recent years, increasing numbers have been observed wintering in Western Europe, particularly in the UK, where they are considered rare but regular autumn visitors.
In the UK , sightings are mainly concentrated along the east coast of Scotland and England, with coastal scrubland habitats. Some individuals regularly end up further afield, as far as the coast of Devon and Cornwall in the southwest.
Distribution
Where to See This Bird
Explore regional guides for locations where this bird has been recorded.
Diet
Yellow-browed Warblers primarily feed on small insects and spiders. They glean prey from leaves and branches, often hovering briefly to snatch insects from the undersides of foliage. During migration, they may also consume small berries to supplement their diet.
Behaviour
Yellow-browed Warblers are active and restless, constantly flitting through foliage in search of insects. They often join mixed-species foraging flocks, especially during migration.
These birds have a characteristic habit of frequently flicking their wings while foraging.
Calls & Sounds
The Yellow-browed Warbler's call is a distinctive, high-pitched 'tsweest' or 'tsu-weet', often repeated. Its song, heard mainly in breeding areas, is a series of high, thin notes that accelerate into a trill, sounding like 'tsi-tsi-tsi-tsi-tsisssss'.
Nesting & Breeding
Breeding occurs from late May to July. Males establish territories and attract females with their song and display flights. Pairs form monogamous bonds for the breeding season.
The nest is a small, domed structure made of grass, moss, and leaves, typically placed low in a conifer or shrub. Females lay 4-6 white eggs with reddish-brown speckles.
Incubation lasts about 11-14 days, primarily by the female. Both parents feed the nestlings, which fledge after 12-14 days. Fledglings remain dependent on parents for another 1-2 weeks.
Conservation
The Yellow-browed Warbler is currently listed as Least Concern by the IUCN due to its large range and stable population.
However, like many migratory species, it faces threats from habitat loss in both breeding and wintering grounds, as well as climate change impacts on migration patterns.
Population
Estimated: Not quantified globally, but 10,000 - 40,000 mature individuals in Europe
Trend: Stable[2]
Elevation
1,000 to 2,440 meters
Additional Details
- Predators:
- Main predators include small raptors such as Sparrowhawks, Merlins, and owls. Nest predators may include corvids, squirrels, and small mammals.
Birdwatching Tips
- Look for quick movements in the canopy of deciduous and mixed forests
- Listen for their distinctive 'tsweest' call, which often gives away their presence
- Pay attention to mixed feeding flocks, especially during autumn migration
- In the UK, check coastal areas and islands during fall migration for rare sightings
Did You Know?
- Despite its name, the Yellow-browed Warbler's 'eyebrows' can appear white in certain light conditions.
- It's one of the smallest passerines to regularly occur in Europe.
- The species has shown a remarkable westward range expansion in recent decades.
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