ハイイロマユアリサザイ Herpsilochmus stictocephalus

Common antwren of mixed-species flocks in forest canopy, but sometimes found away from them; heard frequently but seldom seen. From below, note clean white underparts, long tail, and rather heavy bill. Moves sluggishly along branches and examines leaf clusters. Often occurs in the same flocks as Spot-tailed Antwren and is not safely separable from that species under most viewing conditions, except by voice. Song is distinctive and given throughout the day, often when other species are quiet.