Strikingly bicolored spinetail, bright rusty above and white below. Note the dusky lores. Found in riverine marshes. The song is a loud rattle: “tch-t-t-t-t-t-t-t-t-t-t-t-t-t.”. The similar Yellow-chinned Spinetail has a pale eyebrow and a yellow chin and lacks the dusky lores; its song is similar but drier.