Identification: Differs from other Phylloscopus leaf warblers in Singapore by rather paler upperparts lacking olive tones, lack of wingbars, small bill, rather long wings and short tail. In fresh plumage during autumn, underparts, face (and depending on subspecies, crown and mantle also) are washed with yellow. Booted Warbler has a longer tail and proportionately shorter wings, bigger bill, and is overall a bulkier-looking bird despite being the same size.