Chaco Earthcreeper

The Chaco earthcreeper (Tarphonomus certhioides) is a species of bird in the Furnariinae subfamily of the ovenbird family Furnariidae. It is found in Argentina, Bolivia, and Paraguay, and as a vagrant in Brazil. == Taxonomy and systematics == The Chaco earthcreeper has at times been placed in genera Ochetorhynchus and Upucerthia but since the early 2000s has been placed in its current Tarphonomus. It has at times been considered conspecific with the other member of Tarphonomus, the Bolivian earthcreeper (T. harterti). The two of them are sisters to the rusty-winged barbtail (Premnornis guttuliger), and these three are in turn sisters to the tuftedcheeks of genus Pseudocolaptes. The Chaco earthcreeper has three subspecies, the nominate T. c. certhoides (d'Orbigny & Lafresnaye, 1838), T. c. luscinia (Burmeister, 1860), and T. c. estebani (Wetmore & Peters, JL, 1949). == Description == The Chaco earthcreeper is about 16 cm (6.3 in) long and weighs 18 to 31 g (0.63 to 1.09 oz). It is a small earthcreeper with a long and very slightly decurved bill. The sexes' plumages are alike. Adults of the nominate subspecies have an indistinct orange-rufous supercilium on a mostly dark brown face. Their forehead is dull orange-rufous, their crown and…