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👨‍👩‍👧 Parental Investment

Trivers' parental investment theory: The sex investing more in offspring becomes choosy; the other competes for mates. Operational sex ratio affects intensity of competition and choosiness.

Generation: 0
Males: 0
Females: 0
OSR (M:F available): 1.0
Avg Male Matings: 0
Avg Female Matings: 0
Male Variance: 0
Trivers' Theory: Parental investment predicts which sex competes and which chooses. When females invest more (pregnancy, lactation), males compete. Role reversal occurs when male investment exceeds female's (e.g., seahorses, pipefish).