The smallest hornero. Plumage rusty overall with a white eyebrow, a gray crown, and a white throat. Note the gray legs. Found in scrub on river islands and occasionally in human-modified habitats near major rivers. Forages walking on the ground, especially at the water’s edge. The song is a series of fast staccato “kee” notes, usually given in duet. Other horneros with overlapping distributions have longer and louder songs.