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The 24-Hour Window
Female giant pandas are only fertile for 24-48 hours per year, making them one of the hardest animals to breed in captivity.
Giant Panda
Ailuropoda melanoleuca
Female pandas are only fertile for 24-48 hours per year — one of the shortest fertility windows of any mammal.
Vital Stats
🏷️ TypeBear (ursid)
🌍 Found InMountain forests of central China (Sichuan, Shaanxi, Gansu)
📏 Size1.2-1.9m long, 70-125kg
⏳ Lifespan20-30 years
🔞 Sexual MaturityMales: 5-6 years | Females: 4-5 years
💕 Mating SystemPromiscuous (multiple partners during brief fertile window)
📅 Mating SeasonMarch - May (24-48 hour fertile window)
🤰 Gestation95-160 days (variable due to delayed implantation)
👶 OffspringUsually twins, but mother typically raises only 1
🍆 Penis Size3 cm
⏱️ Sex Duration30 seconds
🔬 Notable AnatomyMale penis is only 3cm long — tiny for a bear
⚖️ Sexual DimorphismMales ~10-20% larger