Gray-cheeked Warbler Phylloscopus poliogenys

Striking small warbler with bright white spectacles around each large dark eye; a refreshingly distinctive bird in a particularly frustrating group, thanks to its uniquely dark gray head. Active primarily in the lower levels of broadleaf forests in hilly and montane areas with dense undergrowth. Listen for its high-pitched song, typically 1-2 single note or pairs of notes, followed by a rapid musical series of 4-5 notes; averages higher-pitched than White-spectacled and Golden-spectacled Warblers, with less trilling than the former.