It frequents shrubby regions and bunchgrass almost invariably in pairs or in small groups; very terrestrial, it moves quickly through the thickets. When it flies, it is at low height, often perching in or under shrubs. Not easily mistaken on account of its long and curved bill.The nest is made in caves or burrows where up to four white eggs are laid. Range: three subspecies of Scale-throated Earth-Creeper occur in Patagonia, namely, Upucerthia dumetaria hypoleuca in Neuquén and west of Río Negro, out of the forested region; Upucerthia d. saturatior in wooded Andean regions of Neuquén, Río Negro and Chubut; Upucerthia dumetaria from the pre-Andean region through all the arid regions from Río Negro to Tierra del Fuego.
Source. Illustrated Handbook of the Birds of Patagonia