Black-dotted piculet Foraging birds may repeat the song a few times and then fall silent for several minutes. Birds of this species forage in pairs, often widely separated, or alone. They occasionally join mixed-species flocks. They often "hitch sideways along branches," and they peck or drill like woodpeckers in rotting wood and at broken ends of branches. The taxonomy of "Picumnus" is controversial, and this taxon has been considered conspecific with the white-bellied piculet, conspecific with the golden-spangled piculet, and a synonym (incorrect name) of a subspecies of the scaled piculet ("P. squamulatus obsoletus"). Here it is considered a separate species following
White-wedged piculet are brown above, with pale edgings to the secondaries and tertiaries, and the tail is brown, the two central feathers being white, and there being a white patch on the outer edge near the tip. The throat, breast and belly are white with black scaling, the flanks and lower belly being less scaled than elsewhere. The iris is brown, the beak blackish and the legs grey. The juvenile is similar to the female but has a paler crown. The native range of the white-wedged piculet in tropical South America includes parts of Bolivia, southern Brazil and northern Paraguay; it is