Song a deliberate, hollow, low-pitched series of ~6–7 (sometimes more) notes — 'whu-whu-whu-WU-hu-hu' — the first notes rising slightly and swelling in volume, the last 2–3 level in pitch; also a low, hollow rattle-trill. Recordings: search 'Myrmothera simplex' or 'Tepui Antpitta' on Xeno-canto and the Macaulay Library.