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The world's last surviving male northern white rhino has died after months of ill health. Sudan, 45, was euthanised 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.

Richard Vigne is the CEO of the Ol Pejeta Conservancy where Sudan spent his final years.

(Photo: Sudan the rhino. Credit: Ol Pejeta Conservancy/Glyn Edmunds)