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thu thập và tích lũy tinh trùng tê giác trong 15 năm qua, giờ đến lúc nhân giống bằng phương pháp thụ tinh nhân tạo để loài này khỏi tuyệt chủng...
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For over 20 years, Thomas Hildebrandt has harboured a dream: to save the northern white rhinoceros, the world’s rarest large mammal. On Monday the scientist received the devastating news that Sudan, the last male of the species, had been put down in his northern Kenyan home, aged 45. 

...Prof Hildebrandt is head of reproduction management at the Leibniz Institute for Zoo and Wildlife Research in the eastern suburbs of Berlin. He holds the keys to rescuing the species, discovered in Belgian Congo by the British geologist (nhà địa chất) Richard Lydekker in 1908, when there were hundreds of thousands of the animals, before it was hunted to virtual extinction (tuyệt chủng) for its valuable horn (sừng).

Unlocking the door of a nondescript concrete block at the institute this week, Hildebrandt showed off a cryogenic tank in which 300ml of northern white rhino semen (tinh trùng) is stored in liquid nitrogen at -196C. Hildebrandt has been collecting the samples with colleagues for about 15 years. He couldn’t expose the samples, “because it’s just too delicate,” he said, “it’s truly priceless. Part of the world’s cultural heritage.”

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