The Zoo Spent 4 Years Trying to Breed Two Male Hyenas
For four years, keepers at Japan's Maruyama Zoo carefully adjusted diets, tweaked lighting, and logged hundreds of observation hours — all trying to get their two striped hyenas to breed. They never questioned the basics. Then a DNA test arrived. Both hyenas were male. And it turns out, even the world's top experts often can't tell the difference.
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