Japanese Zoo Spends Years Trying To Mate Male Hyenas

Hyena Mating Fails ... Because Both Are Males

Hyena sexing by sight alone is "very difficult," says a Japanese zoo that spent years trying to mate a pair of males.

The Maruyama Zoo in Sapporo says Kami and Kamutori were obtained in a 2010 exchange with a South Korean zoo that said they were a male and female pair.

Zookeepers put the pair in the same cage for breeding in 2012 but didn't discover they were both males until experts conducted hormone checks while they were under anesthesia.

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