The move from captivity back to the wild - under the protection of the Ol Pejeta Conservancy - is part of a final bid to save the Northern white from extinction.
The rhinos are four of just eight known Northern white rhinos, so hopes that they would settle comfortably into their new environment have been surpassed with the news that they are mating - offering a chance of survival for the sub-species.
The first mating was between Fatu and Suni, both former residents of Dvur Kralove Zoo. The second mating was Sudan - the oldest northern white male - with a southern white known as Aramiet.
‘To see the old boy has still "got it" is hugely encouraging and he also has his eye set on Taura, another one of the southern white females,' says a Conservancy spokesperson.
The Ol Pejeta Conservancy is not-for-profit wildlife conservancy in the Laikipia district of Kenya and the largest sanctuary for black rhinos in East Africa.
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