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The Richest Milk on Earth
Harp seal milk is about 50% fat — the fattiest of any mammal — allowing pups to gain 5 pounds per day and be weaned in just 12 days.
Harp Seal
Pagophilus groenlandicus
These Arctic seals have evolved extreme efficiency in nursing their pups.
Vital Stats
🏷️ TypePinniped (earless seal)
🌍 Found InNorth Atlantic and Arctic Ocean — breeds on pack ice
📏 Size1.5-2m, 115-180kg
⏳ Lifespan30-35 years
🔞 Sexual MaturityMales: 7-8 years | Females: 4-6 years
💕 Mating SystemPolygynous — males compete in water; mate soon after females give birth
📅 Mating SeasonMarch (on ice floes)
🤰 Gestation11.5 months (includes 3 months delayed implantation)
👶 Offspring1 pup per year
🍆 Penis Size15 cm
⏱️ Sex Duration30 seconds
🔬 Notable AnatomyMilk is 50% fat; pups gain 2kg/day and are weaned in just 12 days
⚖️ Sexual DimorphismMales slightly larger; both have harp-shaped markings