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A
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(Color online) Although twitter calls are phrased, they are often observed as a distinct syllable in a compound call type. In compound call types involving twitter calls, the twitter may be preceded by a trill which often blends into the beginning twitter phrase [(A) and (D)], and/or followed by one or more peeps [(B), (C), and (D)], or followed by one or more phees [(E) and (F)].
