Bicolored Wren

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 of the tail feathers except the middle pair have a white band near the end. The throat and the entire underparts are white. Voice: The male bicolored wren's song is "a series of multiple loud gurgling notes" . The female's is similar but includes a trill. The songs vary widely across the species' range. Its calls are "mostly harsh and grating" .