Song: Various loud liquid whistles "pee-uuu" or "wee'chooo", drawn out down-slurred "tseeeu" an sharp "piik" or "weet" notes.
Sound: Fernando González-García (Biblioteca de Sonidos Aves de México); 2004 Apr 16; Mexico, Veracruz; Mahuixtlan, Coatepec; Adult; Primary Sound;