This raster layer represents the number of threatened species of mammals, amphibians and birds potentially occurring in each ~1km grid cell. Species range data were rasterised at 30 arc-seconds (approximately 1km at the equator) from IUCN Red List polygons (IUCN 2020) for those with a Red List status of Critically Endangered, Endangered or Vulnerable. Raster layers for each species were summed together with equal weighting into a single richness layer.<br><br>The species included are used as a proxy to represent threatened terrestrial biodiversity and are based on taxonomic groups that have been comprehensively assessed by IUCN Red List. Thus users should be aware of the taxonomic bias and that marine values are based only on marine species of mammals and birds.<br/><br>Source: IUCN 2020. The IUCN Red List of Threatened Species. Version 2020-4 <a href="http://www.iucnredlist.org" target="_blank">IUCNRedList</a>.<br><br>Terms of Use: <a href="http://www.iucnredlist.org/info/terms-of-use" target="_blank">Commercial use is not permitted</a><br/> EPSG:3857