Black wildebeest
Black wildebeest act as hosts to a number of external and internal parasites. A study of the animal in Karroid Mountainveld (Eastern Cape Province, South Africa) revealed the presence of all the larval stages of the nasal bot flies "Oestrus variolosus" and "Gedoelstia hässleri". The first instar larvae of "G. hässleri" were found in large numbers on the dura mater of wildebeest calves, specially between June and August, and these later migrated to the nasal passages. Repeated outbreaks of mange (scab) have led to large-scale extinctions. The first study of the protozoa in blue and black wildebeest showed the presence of 23 protozoan species in the rumen, with "Diplodinium bubalidis" and "Ostracodinium damaliscus" common in all the animals.
Black wildebeest
The black wildebeest inhabits open plains, grasslands, and Karoo shrublands in both steep mountainous regions and lower undulating hills. The altitudes in these areas vary from . The herds are often migratory or nomadic, otherwise they may have regular home ranges of . Female herds roam in home ranges around in size. In the past, black wildebeest occurred in the highveld temperate grasslands during the dry winter season and the arid Karoo region during the rains. However, as a result of massive hunting of the animal for its hide, they vanished from their historical range, and are now largely limited to game farms and protected reserves in Southern Africa. In most reserves, the black wildebeest shares its habitat with the blesbok and the springbok.