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English: The dusky warbler, belonging to the leaf warbler family, is indigenous to the east Palearctic region. The genus name, Phylloscopus, originates from the Ancient Greek words phullon, meaning "leaf," and skopos, signifying "seeker." The specific epithet, fuscatus, is derived from the Latin term fuscus, denoting "dark." This species demonstrates a robust migratory pattern, spending its winters in South Asia and South-east Asia.

Characterized as a petite songbird, the dusky warbler exhibits a mud-brown dorsal plumage and a paler ventral aspect. It features a pale tan supercilium, with white only in the lores, and a distinctive black eyeline. Notably, it possesses a smaller bill compared to its analogous counterpart, Radde's Warbler, identifiable by the predominantly white supercilium (tan only in the lores). The dusky warbler is known to inhabit a diverse array of environments, ranging from open forests to the peripheries of agricultural fields, where dense, low vegetation prevails.

This species engages in foraging activities close to the ground, frequently venturing out of concealment to explore its surroundings. Its presence is often revealed by the distinct, persistent "tak" calls emitted while in motion but out of plain view. The dusky warbler's song is characterized by a monotonous and concise series of rapidly repeated phrases: "jijijijiji."