SEARCH

SEARCH BY CITATION

Keywords:

  • siamang;
  • duet;
  • bitonal scream;
  • anti-resonance;
  • Hylobates syndactylus

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.