ATH 352-01

Chimps & Bonobos: comparison

Pan taxonomy

  • Pan troglodytes
    • verus (3d species?)
      • WAfr
    • troglodytes
      • central Afr
    • schweinfurthii
      • E Afr
      • long hair
    • vellerosus (?)
      • .NG
  • Pan paniscus
    • monotypic
    • hair part
    • longer limbs
    • smaller heads
    • more muscle mass

behavioral similarities

  • frugivory
  • sexual dimorphism (intermediate)
  • fission fusion communities
  • male tolerance for other adult males
  • female sexual swellings
  • nest building
  • most infants fathered by ggroup males
    • contra Falk 2000:334
  • cognitive abilities

highly articulated facial musculature: allows for signaling via facial expression

behavioral differences

chimpanzees

  • females transfer, males stay
  • tool use (female)
    • foraging
    • agonism
  • hunting (male)
    • meatsharing
  • vocalizations loud
  • quadripedalism
  • much aggression

Bonobo

  • males & felames both stay or transfer
  • little tool use
    • branch dragging
  • females share fruit
  • vocalizations high-pitched
  • more bipedalism
  • little aggression

male social behavior

Chimp

  • male alliances
    • usually related
    • some all-male groups
  • male aggression against females, infants
  • male sexual competition
  • male dominance
  • male territoriality
  • much grooming

bonobo

  • mixed sex parties
  • no male bonding
    • related or not
  • little male aggression
  • no sexual competition
  • mother-pson affiliation
  • intergroup mating

social behavior – female

chimp

  • no female bonding
  • mother-infant parties
  • mating only in estrus

bonobo

  • females bond, cooperate
    • though unrelated
  • female dominance
    • also co-dominance
    • female aggression
  • female intervention
  • long female receptivity
    • 20 days
  • non-reproductive sex
    • female g-g rubbing

model for human ancestor?

  • which Pan is better model?
    • troglodytes or paniscus?
  • morphological difference
    • relative weight of legs
  • behavioral
    • bipedality
    • aggression
    • sexual receptivity

 

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