Bicolored Wren

The bicolored wren (Campylorhynchus griseus) is a species of bird in the family Troglodytidae. It is found in Colombia, Venezuela, Guyana, and Brazil. == Taxonomy and systematics == The bicolored wren has six subspecies: C. g. albicilius Bonaparte (1854) C. g. bicolor Pelzeln (1875) C. g. griseus Swainson (1837) C. g. minor Cabanis (1851) C. g. pallidus Phelps & Phelps Jr. (1947) C. g. zimmeri Borrero & Hernandez-Camacho (1958) It has sometimes been treated as conspecific with the giant wren (Campylorhynchus chiapensis) and might form a superspecies with it. Subspecies C. g. zimmeri has been considered to be an intergrade between albicius and the nominate griseus. == Description == The bicolored wren is the largest South American wren and second in size only to the giant wren overall in the family. It is 21 to 22 cm (8.3 to 8.7 in) long and weighs 37 to 46.5 g (1.31 to 1.64 oz). The sexes are similar. The nominate adults have dark chocolate crowns and napes and their upperparts a paler chocolate. An off-white supercilium separates a dark brown stripe through the eye from the crown and the rest of the face is also white. Their tail is dark brown; all…