Ologies with Alie Ward

Primatology (MONKEYS & APES) with Kate Gilmore

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Sep 26, 2017
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INSIGHT

Testicle Size and Social Structure

  • Primate social structures correlate with testicle size.
  • Large testicles indicate multi-male, multi-female groups with high competition, while small testicles indicate single-male harems.
ANECDOTE

Sperm Count and Social Rank

  • Chimps and bonobos need more sperm due to lower social standing, hence larger testicles.
  • Gorillas and orangutans, with assured paternity, require less.
ANECDOTE

Gorilla Bachelor Groups

  • Young male gorillas leave their family group to form bachelor groups.
  • They challenge established silverbacks for dominance and females.
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