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The IUCN Red List categories
The IUCN Red List of Threatened Species serves as the world's most comprehensive inventory of the global conservation status of biological species, playing a critical role in informing and guiding conservation actions. Established by the International Union for Conservation of Nature (IUCN), it employs a rigorous set of criteria to assess and categorize species based on their risk of extinction. The main categories, ranging from least concern to extinction, include: Extinct (EX), Extinct in the Wild (EW), Critically Endangered (CR), Endangered (EN), Vulnerable (VU), Near Threatened (NT), and Least Concern (LC). Additionally, there are categories for Data Deficient (DD) and Not Evaluated (NE). Each category reflects a specific level of extinction risk, determined by population size, rate of decline, geographic distribution, and population fragmentation. The Red List is an indispensable tool for policymakers, conservationists, and the public, highlighting species requiring urgent protection and monitoring global biodiversity trends.
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