Sudan (1973 – 19 March 2018) was a captive northern white rhinoceros (Ceratotherium simum cottoni) that lived at the Safari Park Dvůr Králové in the Czech Republic from 1975[3] to 2009 and the rest of his life at the Ol Pejeta Conservancy in Laikipia, Kenya.

[9] Two years later they were joined by Nasima, who originated from Uganda but came from Knowsley Safari Park[10] near Prescot, England, and Saut was later lent to San Diego Zoo in the United States.

[11] After 1980, the northern white rhinos were wiped out in Uganda and Sudan, and 13 were left in Garamba National Park in Zaire (now Democratic Republic of the Congo).

The Conservation Breeding Specialist Group of the IUCN met in 1986 in Dvůr Králové Zoo to discuss ways to preserve the dwindling number of northern white rhinos.

Sudan fathered Nabire (dam: Nasima, studbook number 0351),[13] who was born on 15 November 1983,[14] and died at Dvůr Králové Zoo in July 2015.

[13] The second-to-last male northern white rhinoceros in the world was Angalifu, who lived at the San Diego Zoo Safari Park with Nola until his death on 14 December 2014.

Substantial debate succeeded and strong objections were raised against this proposal, especially given the fact that expert and scientific organizations were available in Europe and insemination efforts could have continued in the Czech Republic.

[19] In December 2009 the rhinos were moved to the Ol Pejeta Conservancy for a "Last Chance To Survive" breeding program, along with three other northern white rhinoceroses.

[26] After the death of Sudan, Dvůr Králové Zoo spokesman Jan Stejskal declared that "We must take advantage of the unique situation in which cellular technologies are utilized for conservation of critically endangered species.

"[27] There are now ongoing attempts at in vitro fertilization of eggs from Najin and Fatu with semen from Sudan and to implant the resulting blastocysts in suitable female southern white rhinos.

They created a Tinder account for Sudan, the last standing male of northern white rhinos, and the app's users could swipe right to make their donations for the development of breeding methods.