White-wedged Piculet

The white-wedged piculet is 10 to 11 cm (3.9 to 4.3 in) long and weighs 9 to 11 g (0.32 to 0.39 oz). Adult males of the nominate subspecies have a black cap with wide red tips on the forehead feathers and small white spots on the rest of the cap. Their face and hindneck are mostly white with a strong brown tinge and a white stripe behind the eye. Their upperparts are warm brown to grayish brown, sometimes with faint pale tips on the feathers. Their flight feathers are dark brown with narrow buffish white edges on the secondaries and tertials. Their tail is dark brown; the innermost pair of feather have mostly white inner webs and the outer two pairs have a wide white patch near the end. Their chin and throat feathers are pale buffish white with black edges that give a scaly appearance. Their underparts are mostly whitish with a pale buff wash; the breast has a scalloped appearance from black feather edges and the belly is plain or slightly streaked. Their iris is brown, the orbital ring grayish, the bill black with a paler base on the mandible, and the legs gray to green-gray. Adult females are identical but for no red on the forehead. Juveniles are duller than adults and their underparts look more barred than scalloped. Subspecies P. a. guttifer is larger than the nominate. …

The nominate subspecies of white-wedged piculet is found in north-central and eastern Bolivia, southwestern Brazil's Mato Grosso state, northern Paraguay, and northwestern Argentina. P. a. guttifer is found in eastern and central Brazil from Pará and Maranhão south to Mato Grosso and São Paulo. The species inhabits denser areas in moderately dry cerrado and also gallery forest. In elevation it ranges from the lowlands to as high as 2,100 m (6,900 ft).

Little is known about the white-wedged piculet's foraging technique or diet, but data from the northern Pantanal in Brazil suggests that they eat exclusively ants.