The world’s first test tube lions are thriving a month after they were born, raising hopes the process could be used to save endangered big cats from extinction. The two cubs, named Viktor and Isabel, arrived following the artificial insemination of their mother by scientists at the University of Pretoria in South Africa. Experts say the pioneering IVF – in which a male’s sperm was placed into the female egg – could now be used to breed species of tiger, lynx and snow leopard, whose numbers are all falling.
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