Schwarzschwanz-Ameisenvogel Oneillornis lunulatus

Scarce antbird of lowland rainforest understory in eastern Ecuador and northeastern Peru. Both sexes have white throat and eyebrow. Male is otherwise all gray, and female is brown with tan scaling on upperparts and buff spots in the tail. Male is similar to White-throated Antbird, but lacks white barring in tail; also note range and voice. Typically found alone or in pairs, often around swarms of marauding army ants. Song is a fast, decelerating series of emphatic notes.