嘰喳柳鶯 Phylloscopus collybita

A very plain leaf warbler found in a variety of wooded and scrubby habitats, often near water. Best identified by voice: song is a slightly jerky double-noted chiff-chaff, chiff-chaff..., very different from song of the similar Willow Warbler. Relative to Willow Warbler, Chiffchaff is often duller, more brownish overall with weaker pale eyebrow, dark legs, and tends to habitually dip its tail. Also similar to Booted and Sykes’s Warbler, but these are browner toned with darkish legs and bill.