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.
Black-capped squirrel monkey
The black-capped squirrel monkey ("Saimiri boliviensis") is a South American squirrel monkey, found in Bolivia, Brazil and Peru. This South American monkey can be found in numerous zoos (with over 80 zoos keeping them in Europe alone, the majority of them being of the Bolivian subspecies) around the world, including the Ellen Trout Zoo, London Zoo, Apenheul Primate Park, Copenhagen Zoo and Auckland Zoo. Black capped squirrel monkeys are flexible omnivores, with diets including insects, fruits, flowers, eggs, and even small vertebrates (NeuroImage, Academic Press).