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 squirrel
Black squirrels can also be found in the United Kingdom, where grey squirrels were first introduced from North America at the end of the 19th century. They are concentrated in Eastern and South Eastern areas of England, but have been witnessed across the country. The origin of the UK's black individuals has been a topic of dispute, with initial research indicating that black-colored individuals are descendants of zoo escapees. Regardless of their origins, the black squirrel population in the UK continues to grow, and around the towns of Letchworth, Stevenage and Hitchin, as well as nearby villages such as Shillington and Meppershall in England, black squirrels are now as abundant as grey individuals. Black squirrels have been present and studied in Cambridgeshire since the 1990s; in the village of Girton three quarters of the squirrel population is black.