This is an adult showing yellow eyes and lacking white eyebrow. This species is famous for duetting antiphonally, each member of a pair singing different parts of a combined song. Bare yellow skin on the sides of its neck form air sacs inflated during song. Similar inflatable air sacs are found in the completely unrelated Prairie Chicken. Formerly classified variously as a thrush, thrasher or wren, this unique bird is now placed in its own family, the Donacobiidae believed to be allied with certain Old World warblers. Four subspecies are usually recognized. This is D. a. nigrodorsalis found in eastern Peru. It is smaller, blacker above and has barring on its flanks as seen here.
