World Bird List

Species factsheet
Bar-breasted Piculet (Picumnus aurifrons)

Order: Picumnus aurifrons
Family: Woodpeckers (Picidae)

Voices can be found here (external link)
Subspecies and Distribution
Subspecie Distribution
aurifrons n Mato Grosso (c Brazil)
transfasciatus Rio Tapajós to Rio Tocantins (ne Brazil)
borbae lower Rio Madeira to lower Rio Tapajós (nc Brazil)
wallacii lower Rio Purús to lower Rio Madeira (wc Brazil)
purusianus upper Rio Purús (w Brazil)
flavifrons ne Peru and nw Brazil
juruanus upper Rio Juruá (e Peru and w Brazil)