The warbling vireo's song is a cheerful warble, similar to that of the painted bunting. Their song is a rapid, cheery warble or a variety of chirps. Adults "growl" and "warble" to warn off conspecifics and predators. The song of the Dartford warbler is a distinctive rattling warble. The warble can be approximated by use of vibrato techniques. The Yak Maniak enabled the user to cause their recordings to stutter, echo or warble. The warble sounds as if the flute is vacillating back and forth between distinct pitches. He spoke favorably of Amanfu's vocals, finding that her "harried backing warble fits [the] song". Embry has just a small warble of a voice, but it carries immense weight. The song of this bird is a bright repetitive warble. In 1980, Niven began experiencing fatigue, muscle weakness, and a warble in his voice. Adult warble flies are large, hairy and bumblebee-like and brown, orange or yellow in color. The Hypodermatinae include large parasitic flies, some of which are known as warble flies. The song is a short musical warble. The song is a variable, rich-toned warble resembling that of the black-headed grosbeak, but shorter.