The aberrant bush warbler (Horornis flavolivaceus) is a species in the bush warbler family, Cettiidae. It was formerly included in the "Old World warbler"

 

The Aberrant Bush Warbler (Horornis flavolivaceus) is a small, elusive songbird found in parts of Asia, known for its secretive nature and melodious song. Despite its modest appearance, it is a fascinating species due to its widespread range and adaptability.

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🐦 Basic Information

Feature	Details
Scientific Name	Horornis flavolivaceus
Common Name	Aberrant Bush Warbler
Family	Cettiidae
Order	Passeriformes
IUCN Status	Least Concern
Size	~12–13 cm (small)
Distribution	Himalayas, Southeast Asia, southern China, Taiwan, and parts of Indonesia

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🌍 Habitat

• Found in dense undergrowth of montane forests, shrublands, and bamboo thickets

• Prefers elevations between 1,000–3,000 meters, especially in subtropical or tropical moist forests

• Very shy and secretive, often heard before seen

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🔍 Identification Features

• Coloration: Dull olive-brown upperparts, lighter underparts

• Face: Pale eyebrow stripe (supercilium) gives it a distinctive expression

• Tail: Rounded and often flicked

• Bill: Thin and pointed, typical of insectivorous birds

• Song: Loud, clear, repetitive whistles — used to mark territory and attract mates

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🍽️ Diet

• Primarily insectivorous

• Feeds on insects, spiders, and small invertebrates

• Forages close to the ground, hopping through thick foliage

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🛡️ Conservation Status

• Least Concern (LC) — thanks to a wide range and stable population

• Still, habitat loss due to logging and agriculture can pose local threats

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🔎 Interesting Facts

• Formerly placed in the Sylviidae (Old World warblers), but now classified under Cettiidae due to DNA studies.

• The term “aberrant” in its name refers to its atypical behavior and plumage compared to other warblers in the region.

• More often detected by song than by sight due to its dense habitat preference.

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