Peninsula Sandstone Fynbos occurs on the uppermost slopes of Constantiaberg and Vlakkenberg. It is confined to the sandstone geology, which weathers to a coarse sand. The soil is exceptionally poor in nutrients and the carrying capacity for supporting animals is very low. Animals do occur, but at extremely low densities. The most common vertebrates are sunbirds and sugarbirds, subsidized by nectar provided by plants. But in terms of plants this veld type is extremely rich: based solely on the large number (64) of threatened species, this veld type is classified as Endangered. Some 140 species of plant are categorized as endemic to this vegetation type - they occur nowhere else on earth. This high richness can be explained by the topography (greater relief means more habitats), the proximity to the sea (which limits the variation in climate, so that species occur in narrower zones on the mountain, thus packing more communities and species into the same altitudinal range), and the long isolation of the Peninsula mountains from the other mountains (so that fewer species are shared with neighbouring mountains at Kogelberg, Hottentots Holland and Piketberg, resulting in more unique species). This vegetation type is well conserved: 97% remains; with 90% conserved.