ATH 352-01

Gibbons (Hylobates) & Siamangs: lesser apes

  • ischial callosities
  • sleep while seated
  • extremely long arms
    • highest intermembral index of all apes
  • not sexually dimorphic
    • sometimes color difference between M/F
    • vocalizations do differ
  • 12 species of gibbon
    • Siamang is gibbon species
  • Genus may need ot be reconfigured due to genetic data
  • largely monogamous pairings
    • serial monogamy
    • reduces incidence of infanticide
  • females are “jealous,” intolerant of other females
  • frugivorous
    • scarcity leads to small groups
    • avoid competition for fruit by foraging in high canopy
  • exclusive to Asia
    • primarily SE Asia (Vietnam, Malaysia, Indonesia)
  • Siamang: Hylobates syndactylus
    • minimal sexual dimorphism
    • most are black
    • Malaysia, Indonesia

Gibbon vocalization

  • great call (females only)
    • territoriality & spacing
    • mate attraction
    • strengthen pair bonds

 

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