The slender antbird is often seen on the ground, singly, in pairs or in family groups, searching for food. It moves deliberately with heavy hops and pauses to scan for prey, such as cockroaches, winged termites and spiders. It also rummages in leaf litter trapped amongst the leaves of large, terrestrial bromeliads. Pairs of slender antbirds appear to have small home ranges, up to 50 meters across, which are separated from those of other antbirds by 100 meters or more. Breeding is thought to begin in October, and decline between December and February with the onset of rains (2) (4).