Sudan, 45 and elderly by rhino standards with a host of health problems, was put down by veterinarians yesterday. There are only two females left, so IVF is the only hope for preserving the species.
If it makes you feel any better, nobody treated the northern population as a distinct species prior to a few years ago, while the southern population is a conservation success story. From being presumed extinct in the late nineteenth century there are now more 20,000 of them - the most populous of living rhino species.