The Slaty Gnateater is a member of the Conopaphagidae, a group of understory birds closely related to the antbirds (Formicariidae). The Slaty Gnateater is restricted to a narrow elevation belt in the lower foothill hill-forest south of the Amazon River in southeastern Peru and Bolivia. It is sexually dimorphic, with males being brown above and entirely slaty gray, with a bright white line behind the eye. Gnateaters are found in isolated pairs throughout the forest, with Slaty being particularly difficult to see due to its preference of steep forest. Often detected by its explosive, raspy call. Replaced to the north in the foothills of much of Peru and Ecuador by the Chestnut-crowned Ganteater (Conopophaga castaneiceps).