Black-browed Bushtit
Aegithalos iouschistos
棕额长尾山雀
Introduction
Aegithalidae family member native to high-elevation forests of China and Myanmar. This tiny, long-tailed passerine has a rotund body and an exceptionally long tail. It forages actively in flocks through the canopy, feeding on small insects. The species was until recently classified as conspecific with the Himalayan rufous-fronted bushtit (Aegithalos iouschistos). Recent taxonomic revisions recognize it as a distinct species endemic to southwestern China, though the relationship between these populations remains debated. It inhabits temperate and boreal forest zones.
Description
A diminutive passerine with an oversized tail, this species measures 11-12 cm in length, with the tail comprising nearly half the total body length. The upperparts display neutral grey plumage, while the underparts show rufous coloring on the breast and flanks, contrasting with a clean white belly. The head pattern is distinctive: a broad black mask frames the face, set against a buff-colored crown and forehead, with a white bib marked by black speckling centrally. Subspecies variation exists, with A. b. sharpei of western populations showing a white head instead of buff, a pronounced dark breastband, and buff-toned underparts.
Identification
This species closely resembles the rufous-fronted bushtit of the central and eastern Himalayas, with which it was formerly classified as conspecific. The two taxa differ subtly in plumage tones and head pattern details, though identification in the field requires careful observation. The broad black facial mask combined with the buff head and white speckled bib helps distinguish it from other Aegithalos species in its range.
Distribution & Habitat
Occupies mid-southern regions of China, with scattered populations extending into northeastern Myanmar. Inhabits temperate and boreal forest environments at higher elevations, typically remaining within the forest canopy and edge habitats where it can move in mixed-species foraging flocks.
Source: Wikipedia · CC BY-SA 3.0
Taxonomy
- Order
- Passeriformes
- Family
- Aegithalidae
- Genus
- Aegithalos
- eBird Code
- bkbtit3
Subspecies (4)
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Aegithalos iouschistos bonvaloti
southern China (southeastern Tibet to Sichuan and Yunnan) and northeastern Myanmar
-
Aegithalos iouschistos iouschistos
Himalayas (Nepal to northern India and southeastern Tibet)
-
Aegithalos iouschistos obscuratus
mountains of western China (Sungpan region of northeastern Sichuan)
-
Aegithalos iouschistos sharpei
montane forest of southwestern Myanmar (Mount Victoria)
Data Sources
Species description from Wikipedia, licensed under CC BY-SA 3.0.
Bird images and sounds sourced from GBIF, contributed by citizen scientists worldwide under Creative Commons licenses.
Taxonomy data from AviList 2025.