Chestnut-backed antbird Poliocrania exsul

Medium-sized antbird with pale blue facial skin. Look for warm brown back and gray head; males have entirely gray body, females brown. Frequently flicks tail down and slowly raises it back up. Sticks to the understory in mature forest, where it can be difficult to get a clear view. Usually in pairs. Distinctive song: two or three whistles, the last note dropping in pitch.