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 and heavily degraded former forest. The white-barred piculet was first described in 1825 by the Dutch zoologist Coenraad Jacob Temminck. It was given the name "Picumnus cirratus", the specific name meaning "curly headed", "cirrus" being Latin for a ringlet or curl. Molecular studies show that it is the sister species to "P. temminckii" and also closely related to "P. dorbignyanus", and at different times these species have been treated as synonymous. Six subspecies are recognised; "P. c. confusus" found in southwestern Guyana, northern Brazil and French Guiana; the Marajo piculet, "P. c. macconnelli" found in the eastern Amazon region of