IUCN Red List
Definition
The IUCN Red List of Threatened Species is the world's most comprehensive inventory of the conservation status of plant and animal species, maintained by the International Union for Conservation of Nature. Species are assessed and placed into categories from Least Concern to Extinct. As of 2024, five penguin species are classified as Endangered or worse, and several more are Vulnerable. The Red List assessment for each species relies on population size, rate of decline, geographic range, and habitat fragmentation.
Related Terms
Endangered is an IUCN Red List category indicating a species faces a very high risk of extinction in the wild.
Conservation status is a classification assigned to a species based on its extinction risk, most commonly using the IUCN Red List categories: Least Concern, Near Threatened, Vulnerable, Endangered, Critically Endangered, Extinct in the Wild, and Extinct.
Population trend describes whether a species is increasing, stable, decreasing, or unknown over a defined time period, typically three generations.
Frequently Asked Questions
What does iucn red list mean in penguin biology?
The IUCN Red List of Threatened Species is the world's most comprehensive inventory of the conservation status of plant and animal species, maintained by the International Union for Conservation of Nature. Species are assessed and placed into categories from Least Concern to Extinct. As of 2024, five penguin species are classified as Endangered or worse, and several more are Vulnerable. The Red List assessment for each species relies on population size, rate of decline, geographic range, and habitat fragmentation.
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Glossary entries define the language. FAQ answers common questions; guides carry the longer Survival Lab arguments.
More in conservationWhere this definition comes from
Reference bodies behind the conservation terminology. Links last checked August 5, 2026.
- IUCN Red List - Global conservation assessments and extinction-risk categories.
- BirdLife Data Zone - Species accounts, distribution, and population summaries.
- SANCCOB - African penguin rescue, rehabilitation, and conservation context.