taxonomic revisions result in the total number of recognised species within a group changing.Īll of the statistics presented in the summary tables are for species only (i.e., they do not include subspecies, varieties or geographically isolated subpopulations or stocks).other species are being reassessed resulting in some moving into different Red List Categories and. species are constantly being assessed and added to The IUCN Red List for the first time.The number of species listed in each IUCN Red List Category changes over time because: To view and download the Summary Statistics Tables, click here. For each Red List update, IUCN provides summaries of the numbers of species in each category, by taxonomic group and by country. The numbers of species listed in each Red List Category change each time The IUCN Red List is updated.
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