Most of the animals of the region have been reduced to small populations, including the critically endangered addax (also known as the white antelope) (Addax nasomaculatus), the endangered slender-horned gazelle (Gazella leptoceros), the vulnerable Dorcas gazelle (Gazella dorcas), the critically endangered dama gazelle (Gazella dama), the near threatened striped hyena (Hyaena hyaena), the vulnerable cheetah (Acinonyx jubatus), the endangered wild dog (Lycaon pictus), and the ostrich (Struthio camelus).[1]