The IUCN Red List of Threatened Species™ now includes 169,420 species, of which 47,187 are threatened with extinction, according to the latest assessment., IUCN Red List of Threatened Species, objective assessment system for classifying the status of plants, animals, and other organisms threatened with extinction. Unveiled in 1994, the list contains criteria and categories to classify species on the basis of their probability of extinction., The IUCN Red List of Threatened Species (also known as the IUCN Red List), is a rich compendium of information on threats, ecological requirements, and habitats of over 160,000 species; and on conservation actions that can be taken to reduce or prevent extinctions., Established in 1964, the IUCN Red List of Threatened Species has evolved to become the world’s most comprehensive information source on the global conservation status of animal, fungi and plant species., The Red List shows how a species is doing and where action needs to be taken to prevent that species – the building bricks of nature – becoming extinct. The IUCN Red List constitutes an important source for setting priorities in nature policy worldwide., On 29 January 2010, the IUCN Red List of Threatened Species identified 5220 (2754 animals, 1 fungus, 2464 plant, 1 protist) endangered species, subspecies and varieties, stocks and sub-populations.. For IUCN lists of endangered species by kingdom, see: . Animals (kingdom Animalia) — IUCN Red List endangered species (Animalia). Amphibians — List of endangered amphibians.