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The 13-Fold Labyrinth
Harbor porpoises have up to 13 vaginal folds that may allow females to control which male's sperm reaches her eggs.
Harbor Porpoise
Phocoena phocoena
One of the smallest cetaceans, harbor porpoises have evolved complex vaginal anatomy that may give females control over paternity.
Vital Stats
🏷️ TypePorpoise (marine mammal)
🌍 Found InCoastal waters of North Atlantic and North Pacific
📏 Size1.4-1.9m, 45-70kg
⏳ Lifespan12-20 years
🔞 Sexual MaturityMales: 3-4 years | Females: 3-4 years
💕 Mating SystemPromiscuous — females mate with multiple males
📅 Mating SeasonJune - September
🤰 Gestation10-11 months
👶 Offspring1 calf per year
🍆 Penis Size25 cm
⏱️ Sex Duration10 seconds
🔬 Notable AnatomyFemales have up to 13 vaginal folds that may control which male's sperm reaches the egg
⚖️ Sexual DimorphismFemales slightly larger than males