Before the rhinos were moved, the species had been declared extinct in the wild.
In 1976, Sudan was moved to the Dvůr Králové Zoo in what was then Czechoslovakia in hopes of saving the subspecies. He fathered two children and a grandchild, who were all part of the group moved to their natural habitat in Kenya.
Sudan died at the age of 45 in 2018 leaving just two of his kind, his daughters, left 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.
“This can be an incredible wake-up call. Even if you live 10,000 miles away, you can make a difference with your awareness or tourism dollars.
“Not all is lost. Even if we don’t save the northern white rhino, we can save the other threatened rhinos and a host of lesser-known species whose numbers are dwindling everywhere.”