A very rare African tick, first descriptionbed in 1843, Cosmiomma hippopotamensis, has been found again, this time in relatively large numbers, on vegetation in Kaokoland, South West Africa. Studies on certain aspects of its ecology and on its reactions to various potential hosts suggest that under natural conditions it prefers to feed on the black rhinoceros, Diceros bicornis. Keywords: Attached to ears, Attempts to feed Cosmiomma, Colophospermum mopane, Commiphora, Description of collecting area, Experimental hosts, Sandy river beds, Terminalia prunioides, Turtles and tortoises hosts and Vegetation savannah.