This is an addax video.
From Wildlife Extra:
One of Africa’s largest National Parks created in Niger
March 2012. More than a decade’s efforts have been crowned as Niger’s Council of Ministers have decreed the formal establishment of the Termit & Tin Toumma National Nature and Cultural Reserve.
At 100,000 km² (38,610 sq. ml) the reserve is one of the biggest in Africa. Created to conserve some of the world’s rarest desert species, like the addax, dama gazelle, cheetah and Barbary sheep, it also contains a large variety of desert habitats, ranging from mountains and valleys to grassy plains, open desert and sand seas. The inclusion in its title of both “natural” and “cultural” underlines the fundamental interrelatedness of both ecological and social aspects in the reserve’s management.
See also here.