Plain-breasted piculet has assessed its conservation status as being of "least concern." Plain-breasted piculet The plain-breasted piculet ("Picumnus castelnau") is a species of bird in the woodpecker family. It is found in the Ucayali and Amazon floodplains in eastern Peru. Its natural habitats are subtropical or tropical moist lowland forests and heavily degraded former forest. A small bird with a short tail, the plain-breasted piculet typically grows to a length of . It is mostly grey on the face and its nape and upper neck are finely barred in an olive green color. Its mantle and back are an olive, brown or
White-barred piculet with several other species of piculet where their ranges overlap; these include the varzea ("P. varzeae") along the Amazon River, the ochre-collared ("P. temminckii") in southeastern Brazil, the ocellated ("P. dorbignyanus") in Bolivia, and the white-wedged piculet ("P. albosquamatus"), also in Bolivia. The white-barred piculet is between long. The sexes differ in that the male has red streaks or a solid red patch on the fore-crown, while the female lacks this. The rest of the crown is black, speckled with white. The upper parts of the body are tan or olive-brown, faintly barred with white, and the main flight feathers