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10,000 Years of Sterile Offspring
Humans have been breeding mules (horse × donkey) for over 10,000 years, despite knowing that nearly all mules are sterile and can't reproduce.
Mule
Equus asinus × Equus caballus
The offspring of a male donkey and female horse has been bred by humans for thousands of years.
Vital Stats
🏷️ TypeHybrid equine
🌍 Found InDomesticated worldwide
📏 Size1.2-1.8m at shoulder, 300-450kg
⏳ Lifespan35-40 years (longer than either parent)
🔞 Sexual MaturityN/A — almost always sterile
💕 Mating SystemMale donkey (jack) × female horse (mare); reverse = hinny
👶 Offspring99.9% sterile — extremely rare fertile female mules documented
🍆 Penis Size50 cm
⏱️ Sex Duration30 seconds
🔬 Notable Anatomy63 chromosomes (between horse's 64 and donkey's 62) prevents meiosis; 'hybrid vigor' makes them stronger
⚖️ Sexual DimorphismVaries like horses; males called 'johns', females 'mollys'