Najin's age and health problems prevent her from mating, according to Ol Pejeta CEO Richard Vigne. The remaining female members of the species, Najin and Fatu, are also unable to reproduce. ![]() But at 42 years old, the last northern white rhino male, named Sudan, is too old to mount a female, and his sperm quality is poor, researchers from the San Diego Zoo Institute for Conservation Research told Live Science in June. ![]() ![]() Of the three endangered rhinos that remain, two are female and one is male.
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