Sings mostly in the morning from mid-level to subcanopy but is 'seldom heard' — a very high, thin, drawn-out 'peeEEEeee'e'e'e'e' that swells then slows on essentially one pitch; also a high thin 'pik' and a rapid 'ti-ti-ti-ti...' rattle. The extreme high pitch is easy to miss for older ears. Search Xeno-canto / Macaulay Library for 'Pipreola formosa' / 'Handsome Fruiteater' and train clients on the thin descending whistle.