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
Large natural populations of black (eastern gray) squirrels can be found throughout Ontario and in several parts of Ohio, Maryland, Michigan, Houston, Indiana, Virginia, Washington, D.C., Iowa, Wisconsin, Minnesota, Pennsylvania, and Kentucky. Populations of gray squirrels in which the black subgroup is predominant can be found in these six areas as well as in smaller enclaves in Missouri, New Jersey, southern New York, Illinois, Connecticut, and California. Outside areas of North America where black squirrels occur naturally in abundance, there are several notable introduced populations of black squirrels:
In the United States, the city of Kent, Ohio developed a significant black squirrel population after ten were legally imported from Canada in February 1961 by Larry Woodell, the head groundskeeper at Kent State University. They have driven out native squirrels in many areas, though they peacefully coexist with most other rodent wildlife.