Japanese zookeepers have abandoned their four-year-long attempt to persuade two spotted hyenas to mate... after they realised both animals were male.
Experts at the Maruyama Zoo, in Sapporo, northern Japan, said they were told Kami and Kamutori were a 'male and female couple' by the South Korean zoo, in Daejon, who sold them the animals in 2010.
But after a year of waiting without joy, they finally tested Kami - who they thought was female - only to find she had male genitalia.
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