Critically endangered

This article is about the conservation designation itself. For lists of critically endangered species, see Lists of IUCN Red List Critically Endangered species.

Conservation status by IUCN Red List category
Extinct
Extinct (EX) Extinct in the Wild (EW)	(list) (list)
Threatened
Critically Endangered (CR) Endangered (EN) Vulnerable (VU)	(list) (list) (list)
Lower Risk
Near Threatened (NT) Conservation Dependent (CD) Least Concern (LC)	(list) (list)
Other categories
Data Deficient (DD) Not Evaluated (NE)	(list)
Related topics International Union for the Conservation of Nature (IUCN) IUCN Red List NatureServe status Lists of organisms by population
v t e

A critically endangered (CR) species is one that has been categorized by the International Union for Conservation of Nature (IUCN) as facing an extremely high risk of extinction in the wild.^[1]

As of 2014, there are 2,464 animal and 2,104 plant species with this assessment, compared with 1998 levels of 854 and 909, respectively.^[2]

As the IUCN Red List does not consider a species extinct until extensive, targeted surveys have been conducted, species that are possibly extinct are still listed as critically endangered. IUCN maintains a list^[3] of "possibly extinct" CR(PE) and "possibly extinct in the wild" CR(PEW) species, modelled on categories used by BirdLife International to categorize these taxa.

Contents

• 
  1 International Union for Conservation of Nature definition
  


• 
  2 See also
  


• 
  3 Notes
  


• 
  4 References
  


• 
  5 External links
  

International Union for Conservation of Nature definition

To be defined as critically endangered in the Red List, a species must meet any of the following criteria (A–E) ("3G/10Y" signifies three generations or ten years—whichever is longer—over a maximum of 100 years; "MI" signifies Mature Individuals):^[4]

A: Population size reduction

1. If the reasons for population reduction no longer occur and can be reversed, the population needs to have been reduced by at least 90%

2. 3. and 4. If not, then the population needs to have been reduced by at least 80%

B: Occurring over less than 100 km² OR the area of occupancy is less than 10 km²

1. Severe habitat fragmentation or existing at just one location

2. Decline in extent of occurrence, area of occupancy, area/extent/quality of habitat, number of locations/subpopulations, or amount of MI.

3. Extreme fluctuations in extent of occurrence, area of occupancy, number of locations/subpopulations, or amount of MI.

C: Declining population of less than 250 MI and either:

1. A decline of 25% over 3G/10Y;

2. Extreme fluctuations, or over 90% of MI in a single subpopulation, or no more than 50 MI in any one subpopulation.

D: Numbers less than 50 MI.

E: At least 50% chance of going Extinct in the Wild over 3G/10Y.

See also

• 
  Ecology portal
  


• 
  Extinct and endangered species portal
  

• 
  Lists of IUCN Red List Critically Endangered species for lists ordered by taxonomic rank.


• 
  Category:IUCN Red List critically endangered species for an alphabetical list


• The World's 25 Most Endangered Primates


• The world's 100 most threatened species


• 
  IUCN for additional information on the IUCN


• List of critically endangered amphibians


• List of critically endangered arthropods


• List of critically endangered birds


• List of critically endangered fish


• List of critically endangered insects


• List of critically endangered invertebrates


• List of critically endangered mammals


• List of critically endangered molluscs


• List of critically endangered plants


• List of critically endangered reptiles


• List of Chromista by conservation status


• List of fungi by conservation status

Notes

1. 
   ^ "IUCN RED LIST CATEGORIES AND CRITERIA" (PDF). 2000-02-09. Retrieved 2018-02-06..mw-parser-output cite.citation{font-style:inherit}.mw-parser-output q{quotes:"""""""'""'"}.mw-parser-output code.cs1-code{color:inherit;background:inherit;border:inherit;padding:inherit}.mw-parser-output .cs1-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/6/65/Lock-green.svg/9px-Lock-green.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-lock-limited a,.mw-parser-output .cs1-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/d/d6/Lock-gray-alt-2.svg/9px-Lock-gray-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/a/aa/Lock-red-alt-2.svg/9px-Lock-red-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration{color:#555}.mw-parser-output .cs1-subscription span,.mw-parser-output .cs1-registration span{border-bottom:1px dotted;cursor:help}.mw-parser-output .cs1-hidden-error{display:none;font-size:100%}.mw-parser-output .cs1-visible-error{font-size:100%}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration,.mw-parser-output .cs1-format{font-size:95%}.mw-parser-output .cs1-kern-left,.mw-parser-output .cs1-kern-wl-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right,.mw-parser-output .cs1-kern-wl-right{padding-right:0.2em}
   


2. 
   ^ IUCN (2014). "Table 2: Changes in numbers of species in the threatened categories (CR, EN, VU) from 1996 to 2014 (IUCN Red List version 2014.2) for the major taxonomic groups on the Red List" (PDF). Retrieved 2014-08-30.
   


3. 
   ^ "Summary Statistics". www.iucnredlist.org. Retrieved 2017-12-10.
   


4. 
   ^ IUCN (February 2014). "Guidelines for Using the IUCN Red List Categories and Criteria" (PDF). Retrieved 10 December 2018.
   

References

• 
  List of Critically Endangered Species. IUCN Red List of Threatened Species. Version 2014.2. International Union for Conservation of Nature. 2014. Retrieved 30 August 2014.

External links

• 
  The Criteria for Critically Endangered, IUCN

v t e Threatened species
Template: Threatened species by region
IUCN Red List	Categories.mw-parser-output .nobold{font-weight:normal} 1 Extinct Extinct (EX) Extinct in the Wild (EW) Threatened Critically Endangered (CR) Endangered (EN) Vulnerable (VU) Lower risk Near Threatened (NT) Least Concern (LC) Lower Risk (LR) Conservation Dependent (LR/cd) Not fully assessed Data Deficient (DD) Not Evaluated (NE) Species Lists Extinct Extinct in the Wild Critically Endangered Endangered Vulnerable Near Threatened Least Concern Data Deficient WP categories Extinct Extinct in the Wild Critically Endangered Endangered Vulnerable Near Threatened Least Concern Data Deficient CITES Appendix I Appendix II Appendix III
By taxa	Endangered arthropods / spiders Threatened Banksia / rays / sharks / Fungi / Chromista The World's 25 Most Endangered Primates The world's 100 most threatened species
Conservation	Biodiversity action plan Biodiversity threats Conservation biology CITES ARKive Bird conservation Conservation status Conservation-reliant species Ecoregion conservation status Habitat destruction Latent extinction risk Rare species Vulnerability and susceptibility
1 Pre-2001 categories and subcategories shown in italics.

v t e Threatened species by region
By region	Blue-listed Environmental Vulnerability Index Regional Red List
Australasia	Environment Protection and Biodiversity Conservation Act 1999 ROTAP Threatened Species Protection Act 1995 Threatened ecological community Trade in Endangered Species Act 1989
Canada	Species at Risk Act Committee on the Status of Endangered Wildlife in Canada
Europe	European Endangered Species Programme Funds for Endangered Parrots
South Africa	Endangered Wildlife Trust
United States	Distinct population segment Endangered Species Act of 1973 Endangered Species Act Amendments of 1978 Endangered species recovery plan Endangered Wolf Center National Wildlife Refuge NatureServe conservation status The Nature Conservancy
Lists	Asia List of endangered and protected species of China Endangered mammals of India List of endangered animals in India List of endangered species in Pakistan List of threatened species of the Philippines List of endangered species in Vietnam Europe Threatened mammals of Europe Endangered plants of Europe List of United Kingdom Biodiversity Action Plan species List of extinct and endangered species of Italy List of extinct and endangered species of Lithuania North America List of endangered plants in North America List of endangered species in North America Endangered mammals and birds of the United States List of threatened mammals of the United States List of threatened birds of the United States List of threatened reptiles and amphibians of the United States Elsewhere Threatened fauna of Australia List of threatened flora of Australia List of endangered flora of Brazil List of threatened mammals of Brazil List of threatened birds of Brazil

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