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