This raster layer represents the number of species of mammals, amphibians and birds potentially occurring in each ~300m grid cell.<br><br>Species range data were rasterised at 10 arc-seconds (approximately 300m at the equator) from IUCN Red List polygons (IUCN 2017) and raster layers for each species were summed together into a single layer with equal weighting. The species are used as a proxy to represent 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 and that marine values are based only on marine species of mammals and birds.<br/><br>Source: IUCN 2017. The IUCN Red List of Threatened Species. Version 2017-3 <a href="http://www.iucnredlist.org" target="_blank">IUCNRedList</a>.<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