Species diversity is not evenly distributed around the world or across continents. Thirty-four biodiversity hotspots have been identified globally. These hotspots collectively comprise just 2.3% of the Earth’s land surface yet hold especially high numbers of species that occur nowhere else – half the world’s plant species and 42% of all terrestrial vertebrate species. They are also home to 75% of the planet’s most threatened mammals, birds and amphibians.
The Southwest Australia Ecoregion is one such global biodiversity hotspot.