Black-chested Sparrow - Peucaea humeralis

Song: Song is usually a single note followed by a rapid liquid, slightly squeaky twitter: "swiet, swieswieswieswieswieswieswieswie". Call notes are short metallic "tek" or "sik" notes.

Sound: Jon King (http://www.xeno-canto.org/58073); 2010 Jun 14; Mexico; KM 17.7 near Xochipala, Xochipala - La Laguna highway , Guerrero; Primary Sound;