Last male northern white rhino dies in Kenya
His death at the age of 45 leaves only two females - his daughter and granddaughter - of the subspecies alive in the world.
Hope for preserving the northern white rhino now lies in developing in vitro fertilisation (IVF) techniques.
The world's last surviving male northern white rhino has died after months of poor health, his carers say.
Sudan, who was 45, lived at the Ol Pejeta Conservancy in Kenya. He was put to sleep on Monday after age-related complications worsened significantly.
His death leaves only two females - his daughter and granddaughter - of the subspecies alive in the world.
Hope for preserving the northern white rhino now lies in developing in vitro fertilisation (IVF) techniques.
"His death is a cruel symbol of human disregard for nature and it saddened everyone who knew him," said Jan Stejskal, an official at Dvur Kralove Zoo in the Czech Republic, where Sudan had lived until 2009.
"But we should not give up," he added in quotes carried by AFP news agency.
"We must take advantage of the unique situation in which cellular technologies are utilised for conservation of critically endangered species. It may sound unbelievable, but thanks to the newly developed techniques even Sudan could still have an offspring."
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