Three out of the five remaining rhinos in the world are found in Sudan, where they are heavily protected against poachers.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/nigeria-only-five-rhinos-remaining-worldwide
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/all-africa
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/wildlife
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/poaching
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/rhinoceros
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/endangered-species
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/sudan
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/africa