Black wildebeest
Where it lives alongside the blue wildebeest, the two species can hybridise, and this is regarded as a potential threat to the maintenance of the species. The black wildebeest was once very numerous and was present in Southern Africa in vast herds, but by the end of the 19th century, it had nearly been hunted to extinction and fewer than 600 animals remained. A small number of individuals was still present in game reserves and at zoos, and from these, the population was rescued.
White-tailed swallow
The Yabelo wildlife sanctuary, located in southern Ethiopia, is a protected area in which the white-tailed swallow can be found. This area is sheltered against destruction of the ecosystem; however, there is previously noted fire suppression in the area which contributes to bush encroachment.