Key Identification Features
- Its contact call is a disyllabic 'hoo-eet', which is distinct from the more monosyllabic 'hweet' contact call of chiffchaffs.
- It is best known for its characteristic warbling song.
- It is distinctly smaller than a chiffchaff, but slightly larger than Pallas's leaf warbler.
- Some individuals show a faint paler green central crown stripe, though many do not display this feature.
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