Active small songbird, endemic to Taiwan. Brown above, white below, with gray head, large white eyering, thin black borders in crown (hard to see at times), and buffy wash in flanks. Very social, often moving in large flocks, sometimes mixed with other species. Inhabits forested regions from the lowlands up into montane forests. Gives harsh, grating chipping and whirring notes while moving in flocks. Song is short but sweet: a melodious warble followed by a hoarse whistle.