An infrequently encountered honeyguide of forests and forest edge. Overall olive-green to green in coloration, with upperparts darker than underparts and the brightest green in the wings. Vent is pale with hints of streaking, and tail has white outer feathers with dark tips. Similar to Cassin’s Honeyguide, but note Zenker’s larger bill, larger size, darker throat, and dark-tipped tail. Overlaps locally with Yellow-footed Honeyguide in Cameroon, but Zenker’s Honeyguide has duskier legs and a darker throat, and where the two overlap, Zenker’s is often found at lower elevations. Vocalizations are little known, but the song apparently consists of repeated typical honeyguide “tjee” notes that slowly rise in pitch before peaking and gradually descending in pitch, given at a rate of 1-2 notes per second for up to 20 seconds.