IUCN Red List
Classification System
The IUCN Red List of Threatened Species is the world's most comprehensive inventory of the global conservation status of biological species. Maintained by the International Union for Conservation of Nature (headquartered in Gland, Switzerland), it uses a rigorous set of quantitative criteria to evaluate species' extinction risk across nine categories.
- IUCN Red List categories (from least to most threatened): Least Concern → Near Threatened → Vulnerable → Endangered → Critically Endangered → Extinct in the Wild → Extinct
- Endangered (EN) criteria: Population reduction >50% over 10 years or 3 generations; or population <2,500 mature individuals; or probability of extinction >20% within 20 years
- The Red List is updated periodically — not annually; each update covers thousands of species reassessments
- Emperor penguins: Moved from Near Threatened → Endangered (skipped Vulnerable, reflecting rapid deterioration)
- Total emperor penguin population: Approximately 270,000–280,000 breeding pairs; ~600,000 individuals
- Red List is advisory — listing does not automatically trigger legal protections in any country but influences national conservation policy
● Tracked since April 09, 2026 · last seen July 23, 2026 · updates as the daily brief publishes
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