When Sudan the white rhino was put down by his carers earlier this year, it confirmed the extinction of one of the savannah’s most iconic subspecies. Despite decades of effort from conservationists, including a fake Tinder profile for the animal dubbed “the most eligible bachelor in the world”, Sudan proved an unwilling mate and died – the last male of his kind. His daughter and granddaughter remain – but, barring some miraculously successful IVF, it is only a matter of time.