Before moving rhinos, the species had been declared extinct in the wild.
In 1976, Sudan moved to the Dvůr Králové Zoo, then Czechoslovakia, hoping to save the subspecies. He had two children and a grandson, who were part of the group that moved to its natural habitat in Kenya.
Sudan died at the age of 45 in 2018 and left only two of these species, their daughters, in the wild.
“At the very least, Sudan is an ambassador for so many other species that need our attention,” National Geographic photographer Ami Vitale told CNN at the time.
“It can be an amazing wake – up call. Even if you live 10,000 miles away, you can make a difference with your conscience or your tourist dollars.
“Not everything is lost. Even if we don’t save the northern white rhino, we can save the other endangered rhinos and a lot of lesser known species whose number is declining everywhere.”