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On the IUCN Red List, endangered is the second-most severe conservation status for wild populations in the IUCN's schema after critically endangered. In 2012, the IUCN Red List featured 3,079 animal and 2,655 plant species as endangered worldwide. [1] The figures for 1998 were 1,102 and 1,197 respectively. [1]
Comparing the number of species in each category of IUCN Red List 1994 IUCN Red List categories (version 2.3), used for species which have not been reassessed since 2001. There have been a number of versions, dating from 1991, including: [29] [30] Version 1.0 (1991) Version 2.0 (1992) Version 2.1 (1993) Version 2.2 (1994) Version 2.3 (1994)
The IUCN Red List of Threatened Species by the International Union for Conservation of Nature is the best known worldwide conservation status listing and ranking system. . Species are classified by the IUCN Red List into nine groups set through criteria such as rate of decline, population size, area of geographic distribution, and degree of population and distribution fragmenta
These conservation status categories are used in Wikipedia articles. For threatened species and species believed to have become extinct after 1500, the categories are based on the IUCN (International Union for Conservation of Nature and Natural Resources) Red List 1994 or 2001 categories.
Version 2014.2 of the IUCN Red List of Threatened Species identified 4574 critically endangered species, subspecies, varieties, stocks, and subpopulations. For IUCN lists of critically endangered species by kingdom, see: Animals (kingdom Animalia) — IUCN Red List critically endangered species (Animalia)
The category was folded into the near threatened (NT) category in the 2001 revision, but some species which have not been re-evaluated retain the assessment. As of July 2016, the International Union for Conservation of Nature (IUCN) listed 238 conservation dependent species. [1] That was 0.29% of all evaluated species listed at the time.
Endangered species by reason(s) they are (or were) threatened — the cause(s) for species being endangered in their native habitats.; This is primarily a sub-category for IUCN Red List species by the external threat(s) stated in IUCN reports for each listed species (hyperlinked under 'References' &/or 'External links' on most wikipedia articles when species are on IUCN Red List).
The Red List Index (sampled approach) (SRLI) has been developed in order to determine the threat status and also trends of lesser-known and less charismatic species groups. It is a collaboration between IUCN members and is coordinated through the Institute of Zoology (IoZ), the research division of the Zoological Society of London (ZSL).