Brief report: Occurrence of anti‐resonance in the song of the siamang (Hylobates syndactylus)

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Abstract
The duetting behavior of siamangs (Hylobates syndactylus) has previously been observed as representing a complex, interactively organized, and standardized set of vocal features. Anti‐resonance in the bitonal screams of 15 males was observed. The sound energy of the fundamental frequency of the first note of these screams are absorbed, the result being a fundamental frequency which was virtually filtered out. The implications and consequences of such a rare phenomenon as anti‐resonance in the vocal behavior in gibbons is discussed.