Blue wildebeest
This species of wildebeest seems to have evolved around 2.5 million years ago. The black wildebeest is believed to have diverged from the blue wildebeest to become a distinct species around a million years ago, in the mid- to late Pleistocene. Fossil evidence suggests that blue wildebeest were quite common in the Cradle of Humankind in the past. Apart from eastern Africa, fossils are commonly found in Elandsfontein, Cornelia, and Florisbad.
Black mongoose
The black mongoose ("Galerella nigrata") is a species of mongoose found in Namibia and Angola. Although originally described as a separate species by Thomas (1928), it was often been considered a subspecies of the slender mongoose. However, genetic analysis has confirmed its status as a separate species. Evidence suggests the two species diverged around four million years ago, likely due to some populations becoming separated as the habitat in southern Africa was changing. The black mongoose now occupies a distinct habitat in areas with large boulders and rocky outcrops known as inselbergs in the mountainous regions of northwest Namibia and southwest Angola. After remaining in these areas for millions of years, the black mongoose is highly specialized to survive in the harsh arid environment.