AO3: Hormonal

• Strength: Animal research

  What? Support from animal research

  Who? Giammanco; macaque monkeys - increase in testosterone and aggressive behaviour in mating season

  Why? Shows role of testosterone
• Limitation: Mixed evidence

  What? Dual-hormone hypothesis

  Who? Carre and Mehta; high levels of testosterone lead to aggression with low cortisol

  Why? Combined activity better predictor