A tiny antwren with a very short tail. Looks like a ping-pong ball bouncing around the middle levels and canopy in lowland forest and edge. Occurs from Panama to Peru and Brazil. Male has a pale yellowish belly, bold black-and-white striping on the head and back, and thick white wingbars. Female is similar, but has a buffier head and upper breast. Best distinguished from Pygmy Antwren by voice. Listen for the long series of piping whistles that accelerates slightly at the end. The series is longer and doesn’t accelerate as rapidly as Pygmy. Also note thicker black mustache stripe and eyeline on Moustached Antwren.