Vegetative cliff habitats are abundant in the Waterberg due to the extensive historic riverine erosion. The African porcupine uses the protection of these cliffside caves. Some trees cling to the cliff areas, including the paperbark false-thorn, that have flaking bark hanging from their thick trunks. Another tree in this habitat is the fever tree, thought by Bushmen to have special power to allow communication with the dead. It is found on cliffs above the Palala River including one site used for prehistoric ceremonies, which is also a location of some intact rock paintings.