An active little bird with a bright yellow belly and a pale-tipped fan-like tail. Most common in foothill and submontane broadleaf forests, where it forages energetically and acrobatically in the middle and lower levels, often with fulvettas, warblers, and other small passerines in mixed-species foraging flocks. Very similar in shape to fantails but much smaller, and actually more closely related to tits. Song is a series of high “tsit” notes interspersed with twitters and trills. Call is often repeated at length, akin to a song, but much simpler, a series of high “tsip” notes.