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The Pallas's Leaf Warbler or Pallas's Warbler (Phylloscopus proregulus) is a leaf warbler which breeds in southern Siberia (from Novosibirsk Oblast east to Magadan Oblast), northern Mongolia, and northeastern China.
The Willow Warbler (Phylloscopus trochilus) is a very common and widespread leaf warbler which breeds throughout northern and temperate Europe and Asia, from Ireland east to the Anadyr River basin in eastern Siberia.
Like all leaf warblers, it was formerly placed in the "Old World warbler" assemblage, but now belongs to the new leaf-warbler family Phylloscopidae.
The Western Hume's Leaf Warbler's range overlaps with that of the Yellow-browed Warbler in the western Sayan Mountains, but the species apparently do not hybridize.
Pallas's Leaf Warbler is named after the German zoologist Peter Simon Pallas, who discovered it on the Ingoda River in Siberia in 1811; the species name proregulus derives from its similar size to the Goldcrest Regulus regulus.