Data deficient

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
v t e

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.^[1]

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"^[2] (see also precautionary principle).

References

^ 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.
^ "The Categories", in IUCN (1983).

External links

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

Threatened species

Template: Threatened species by region

IUCN Red List

Categories¹

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

Conservation

¹ Pre-2001 categories and subcategories shown in italics.

Threatened species by region

By region

Australasia

Canada

Europe

South Africa

Endangered Wildlife Trust

United
States

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

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