NatureInstruct - Dendroica Canada : Guest Version: "Song: Advertising calls consist of a rapidly repeated call and song, both given in flight. Call consists of single, low frequency humming pulses. Song a combination of wheezy "gwarrr-gwarrr-gwarrr" and high twittering whinnies.
Sound: Bill Evans; 1989 Apr; USA, Florida; Adult; Call;"
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