IUCN classifies species into nine groups, set through criteria such as rate of decline, population size, area of geographic distribution, and degree of population and distribution fragmentation:
Extinct (EX) - No individuals remaining.
Extinct in the Wild (EW) - Known only to survive in captivity, or as a naturalized population outside its historic range.
Critically Endangered (CR) - Extremely high risk of extinction in the wild.
Endangered (EN) - High risk of extinction in the wild.
Vulnerable (VU) - High risk of endangerment in the wild.
Near Threatened (NT) - Likely to become endangered in the near future.
Least Concern (LC) - Lowest risk. Does not qualify for a more at risk category.
Data Deficient (DD) - Not enough data to make an assessment of its risk of extinction.
Not Evaluated (NE) - Has not yet been evaluated against the criteria.
Extinct (EX) - No individuals remaining.
Extinct in the Wild (EW) - Known only to survive in captivity, or as a naturalized population outside its historic range.
Critically Endangered (CR) - Extremely high risk of extinction in the wild.
Endangered (EN) - High risk of extinction in the wild.
Vulnerable (VU) - High risk of endangerment in the wild.
Near Threatened (NT) - Likely to become endangered in the near future.
Least Concern (LC) - Lowest risk. Does not qualify for a more at risk category.
Data Deficient (DD) - Not enough data to make an assessment of its risk of extinction.
Not Evaluated (NE) - Has not yet been evaluated against the criteria.
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