Large reddish brown woodcreeper of lowland rainforest. Lightly barred from face to back and underparts; this barring can be quite diffuse and sometimes difficult to see in the field. Average-sized bill can be brown to dark red, depending on the population. A faint dark cheek pattern can often be seen. Similar to some other large unstreaked woodcreepers; weak pattern of horizontal barring and dark brown or red (not gray) bill help differentiate from Cinnamon-throated, Plain-brown, and White-chinned Woodcreepers. Prefers mature forest habitats, and is frequently found singly or in pairs around army ant swarms. Voice is a quick descending series of whistles, shorter and more quickly descending than Black-banded.