This roughly 5000 km2 National Park consists of mount Yangudi and the surrounding Rassa plains, and it harbors the only existing population of the African wild ass, a critically endangered species ancestor to the domestic donkey. Other large Mammal species survive in Yangudi Rassa, notably Beisa oryx, Soemmering’s and Dorcas Gazelle, Gerenuk and possibly Grevy’s Zebra. A good selection of dry country birds is resident in the area. The Arabian Bustard is a special and Ostriches are frequently observed.