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Conservation status by IUCN Red List category
Extinct
Extinct (EX) (list) Extinct in the Wild (EW) (list)
Threatened
Critically Endangered (CR) (list) Endangered (EN) (list) Vulnerable (VU) (list)
Lower Risk
Near Threatened (NT) (list) Conservation Dependent (CD) (list) Least Concern (LC)
Other categories
Data Deficient (DD) (list) Not Evaluated (NE)
Related topics
International Union for Conservation of Nature (IUCN) IUCN Red List NatureServe status Lists of organisms by population
Comparison of Red List classes above and NatureServe status below
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A data deficient (DD) species is one which has been categorized by the International Union for Conservation of Nature (IUCN) as offering insufficient information for a proper assessment of conservation status to be made. This does not necessarily indicate that the species has not been extensively studied, but it usually indicates that little or no information is available on the abundance and distribution of the species. It can also indicate uncertainty about the taxonomic classification of an organism; for example, the IUCN classifies the orca as "data deficient" because of the likelihood that two or more types of the whale are separate species.

The IUCN recommends that care be taken to avoid classing species as "data deficient" when the absence of records may indicate dangerously low abundance: "If the range of a taxon is suspected to be relatively circumscribed, if a considerable period of time has elapsed since the last record of the taxon, threatened status may well be justified" (see also precautionary principle).

See also

• IUCN Red List data deficient species
• List of data deficient amphibians
• IUCN Red List data deficient species (Annelida)
• List of data deficient arthropods
• List of data deficient birds
• IUCN Red List data deficient species (Cnidaria)
• List of data deficient fishes
• List of data deficient insects
• List of data deficient invertebrates
• List of data deficient mammals
• List of data deficient molluscs
• List of data deficient plants
• List of data deficient reptiles

References

1. Reeves, R.; Pitman, R. L.; Ford, J. K. B. (2017). "Orcinus orca". IUCN Red List of Threatened Species. 2017: e.T15421A50368125. doi:10.2305/IUCN.UK.2017-3.RLTS.T15421A50368125.en. Retrieved 19 November 2021.
2. "The Categories", in IUCN (1983).

External links

• IUCN (2001). "2001 Categories & Criteria (version 3.1)". 2014 IUCN Red List. Retrieved 2014-08-26.

v t e Threatened species
Template: Threatened species by region
IUCN Red List	Categories 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	Threatened arthropods / Endangered arthropods / spiders / Decline in insect populations Decline in amphibian populations 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
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	EAZA Ex-situ 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 endemic and threatened plants of 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 Bulgaria Italy Lithuania Russia Ukraine United Kingdom North America List of endangered plants of North America List of endangered animals of 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

• Ecology
• Biology

• Data deficient species
• IUCN Red List
• Biota by conservation status
• IUCN Red List data deficient species